A coordination polymer is an inorganic or organometallic polymer structure containing metal cation centers linked by organic ligands. More formally a coordination polymer is a coordination compound with repeating coordination entities extending in 1, 2, or 3 dimensions. It can also be described as a polymer whose repeat units are coordination complexes. Coordination polymers contain the subclass coordination networks that are coordination compounds extending, through repeating coordination entities, in 1 dimension, but with cross-links between two or more individual chains, loops, or spiro-links, or a coordination compound extending through repeating coordination entities in 2 or 3 dimensions. A subclass of these are the metal-organic frameworks, or MOFs, that are coordination networks with organic ligands containing potential voids. Coordination polymers are relevant to many fields such as organic and inorganic chemistry, biochemistry, materials science, electrochemistry, and pharmacology, ...
The fabrication of electronic devices, such as gas sensors on flexible polymer substrates, enables the use of electronics in applications where conventional devices on stiff substrates could not be used. We demonstrate the development of a new intra-tube electronic-nose (e-nose) gas sensor device with multiple sensors fabricated and integrated on a flexible substrate. For this purpose, we developed a new method of fabricating a sensor array of four gas sensors on a flexible polymer substrate. The method allowed the use of lithography techniques to pattern different polymers with a broad range of solubility parameters. Conductive polymer composites were used as a gas sensitive layer due to the high stretchability of the material. Each of the 30 e-nose devices on one substrate was designed to fit on a polymer strip with a width of 2 mm. A single e-nose strip was successfully integrated into the inlet tube of a gas-measurement apparatus with an inner-tube diameter of 3 mm. Using the e-nose, we were able to
A polarizer is formed with an arrangement of polymer fibers substantially parallel within a polymer matrix. The polymer fibers are formed of at least first and second polymer materials. At least one of the polymer matrix and the first and second polymer materials is birefringent, and provides a birefringent interface with the adjacent material. Light is reflected and/or scattered at the birefringent interfaces with sensitivity to the polarization of the light. In some embodiments, the polymer fibers are formed as composite fibers, having a plurality of scattering polymer fibers disposed within a filler to form the composite fiber. In other embodiments, the polymer fiber is a multilayered polymer fiber. The polymer fibers may be arranged within the polymer matrix as part of a fiber weave.
The present invention concerns blends comprising at least one shape memory polymer and at least one thermoplastic polymer, wherein this thermoplastic polymer does not show shape memory properties. The present invention furthermore concerns methods for preparing such blends and the use of these blends in various applications, including additional products, household equipment etc.
0063] As indicated above, the shape memory polymer may be a copolymer network including the reaction product of a free radically polymerizable siloxane having greater than one functional free radically polymerizable group and at least one (meth)acrylate monomer. The reaction may include, for example, polymerization via curing. Curing may be carried out in an oxygen-free, e.g., in an inert atmosphere such as nitrogen gas or by utilizing a barrier of radiation-transparent material having low oxygen permeability. Curing can also be carried out under an inerting fluid such as water. When visible or ultraviolet radiation is used for curing, the reaction may also contain a photoinitiator. Suitable photoinitiators include benzoin ethers, benzophenone and derivatives thereof, acetophenone derivatives, camphorquinone, and the like. Some examples of commercially available photoinititaors include DARACUR 1173, DAROCUR 4265, IRGACURE 651, IRGACURE 1800, IRGACURE 369, IRGACURE 1700, and IRGACURE 907, ...
Described are fixed and removable orthodontic appliances and components thereof fabricated from shape memory polymer compositions. The preparation and use of such appliances are also disclosed.
Functionalization of nanoparticles can significantly influence their properties and potential applications. Although researchers can now functionalize metal, metal oxide, and organic polymer nanoparticles with a high degree of precision, controlled surface functionalization of nanoscale coordination polymer particles (CPPs) has remained a significant challenge. The lack of methodology is perhaps one of the greatest roadblocks to the advancement of CPPs into high added-value drug delivery applications. Here, we report having achieved this goal through a stepwise formation and functionalization protocol. We fabricated robust nanoparticles with enhanced thermal and colloidal stabilities by incorporation of carboxyl groups and these surface carboxyl groups could be subsequently functionalized through well-known peptide coupling reactions. The set of chemistries that we employed as proof-of-concept enabled a plethora of new functional improvements for the application of CPPs as drug delivery ...
0024] In various embodiments, the components of the dry adhesive or the components of the shape memory polymer may include a rigid epoxy and a flexible epoxy. The range of possible crosslinking chemistries which may be used to achieve a dry adhesive or shape memory polymer may include alpha, omega-diaminoalkanes, organic multi-carboxylic acid, anhydride, or catalytic (as in imidazole type) crosslinking reactions. There are many different ways to achieve the appropriate relationships between the molecular properties. For example, the dry adhesives or shape memory polymers may include a rigid epoxy, an epoxy extender, and a crosslinking agent; or a rigid epoxy, a flexible crosslinking agent, and a flexible epoxy; or a rigid epoxy, a rigid crosslinking agent, and a flexible epoxy; or a rigid epoxy, a flexible epoxy, and a catalytic curing agent; or a rigid epoxy, a crosslinking agent, and a diluent; or a flexible epoxy, a crosslinking agent, and a diluent; or a rigid epoxy and a flexible ...
Long fiber-reinforced polymer structures offer lightweight design potential. However, there is still a need for methods that consider the complex material behavior in the design process. This contribution discusses the integration of the local, anisotropic material properties of long fiber-reinforced polymer structures into the calculation of bead patterns and bead geometries. A workflow to calculate the resulting component stiffness is presented. To this end, mold filling simulations using Moldflow are coupled with a bead calculation process, which uses Abaqus for the structural calculations. This requires a mapping process to provide the results of the mold filling simulation for the bead calculation. As commercial tools do not allow independently modifying the bead parameters height, width, base radius, head radius and flange angle, an algorithm is used to calculate the bead geometry and to generate more degree of design freedom ...
A polymer based circuit production method provides a polymer based circuit by exposing a surface of a polymer substrate to ultraviolet radiation resulting in an adhesion promoted polymer substrate surface. A circuit is fabricated on the polymer substrate surface and a coating material is applied to at least a portion of the adhesion promoted polymer substrate surface. A portion of the circuit fabricated on the polymer substrate surface may be encapsulated. The polymer based circuit resulting from the method includes a polymer substrate having an ultraviolet radiation treated surface, a circuit formed on the polymer substrate surface, and a coating material encapsulating at least a portion of the at least one circuit between the polymer substrate and the coating material.
Inherently conductive polymers (ICPs) are finally about to leap from the laboratory into the commercial world.. Invented in 1977, ICPs have been around for a while, but their true commercial potential has never been realised.. Brian Balmer Industry Analyst at Frost & Sullivan explains, until now, ICPs have been aimed at the traditional conductive polymer markets of electrostatic discharge packaging and anti corrosive coatings. However, they found it difficult to compete on price with existing conductive polymers which are produced by incorporating materials such as carbon black, carbon fibre or fragments of stainless steel into the base polymer. Hence their performance in these markets has been poor. But, new cutting edge technologies such as organic light emitting diodes for flat screen displays, dimmable windows and fuel cells will see sales of ICPs rocket over the next 6 years.. The fastest growth area for the use of conductive polymers is that of Organic Light Emitting Diodes OLEDs, which ...
TY - CONF. T1 - Lithium ion conductive polymer electrolytes by side group rotation(II). AU - Satou, Akira. AU - Nishimura, Shin. AU - Urabe, Syuuichi. AU - Yamamoto, Hitoshi. AU - Ueyama, Norikazu. PY - 2005/12/1. Y1 - 2005/12/1. N2 - In order to improve ionic conductivity of lithium ion conductive polymer at low temperature, novel styrene derivatives (1-4) were synthesized and their ionic conductivities were measured. An ionic conductivity of polymer 1, was above 10-5 S/cm, even at -60°C. Its activation energy below 20°C exhibited 11 kJ/mol. On the other hand, that of poly(ethylene oxide) electrolyte exhibited 105 kJ/mol. The difference of the activation energy implied that lithium ion transfers in polymer electrolytes was promoted by rotation motion of the dimethoxyphenyl side group instead of segmental motion of polymer main chain.. AB - In order to improve ionic conductivity of lithium ion conductive polymer at low temperature, novel styrene derivatives (1-4) were synthesized and their ...
A variety of water-soluble polymers, when attached to a liposome, substantially increase liposome circulation half-life in animals. However, in certain conditions, liposomes modified with the most widely used polymer, polyethylene glycol (PEG), induce an IgM response resulting in an accelerated blood clearance (ABC) of the liposome upon the second injection. Modification of liposomes with other water-soluble polymers: HPMA (poly[N-(2-hydroxypropyl) methacrylamide]), PVP (poly(vinylpyrrolidone)), PMOX (poly(2-methyl-2-oxazoline)), PDMA (poly(N,N-dimethyl acrylamide)), and PAcM (poly(N-acryloyl morpholine)), increase circulation times of liposomes; but a precise comparison of their ability to promote long circulation or induce the ABC effect has not been reported. To obtain a more nuanced understanding of the role of polymer structure/MW to promote long circulation, we synthesized a library of polymer diacyl chain lipids with low polydispersity (1.04-1.09), similar polymer molecular weights ...
Purpose. Crosslinked, degradable derivatives of low-molecular-weight polyethylenimine (PEI) are relatively efficient and non-cytotoxic gene delivery agents. To further investigate these promising materials, a new synthetic approach was developed using a poly(4-vinylpyridine)-supported Fe(III) catalyst (PVP(Fe(III))) that provides more facile synthesis and enhanced control of polymer molecular weight.. Methods. Biodegradable polymers (D.PEI) comprising 800-Da PEI crosslinked with 1,6-hexanediol diacrylate and exhibiting molecular weights of 1.2, 6.2, and 48 kDa were synthesized utilizing the PVP(Fe(III)) catalyst. D.PEI/DNA polyplexes were characterized using gel retardation, ethidium bromide exclusion, heparan sulfate displacement, and dynamic light scattering. In vitro transfection, cellular uptake, and cytotoxicity of the polyplexes were tested in human cervical cancer cells (HeLa) and human breast cancer cells (MDA-MB-231).. Results. D.PEIs tightly complexed plasmid DNA and formed 320- to ...
When a laboratory is producing vascular stents made from memory polymer, theyll need to have the right selection of methods to deliver a quality product.
Polymers represent the leading and versatile type of biomaterials being extensively applied in biomedical applications such as tissue engineering, nano-medicine, medical devices etc.. The versatility of polymers for biomedical uses is attributed to the relative ease with which polymers can be designed with a range of architecture, functionality and appropriate physical, chemical and biological properties.. Functional polymers are special class of polymers where the polymer chains contain one or more reactive groups attached at the chain end or to the backbone. In biomedical applications, functional polymers are used as building blocks to design complex structures such as nanoparticles, bioconjugation, biocompatible surfaces, scaffolds, hydrogels etc.. ...
Polymers with shape memory properties have been prepared using heparin-inspired segments. The polymers have been prepared as films and foams. Both films and foams demonstrate good shape memory behavior as evidenced by fixity and recovery values. The materials properties of the foams can easily be tuned by va Pioneering Investigators
Synthetic polymers are human-made polymers. From the utility point of view they can be classified into three main categories: thermoplastics, elastomers and synthetic fibers. They are found commonly in a variety of consumer products such as honey, glue, etc. A wide variety of synthetic polymers are available with variations in main chain as well as side chains. The back bones of common synthetic polymers such as polythene, polystyrene and poly acrylates are made up of carbon-carbon bonds, whereas hetero chain polymers such as polyamides, polyesters, polyurethanes, polysulfides and polycarbonates have other elements (e.g. oxygen, sulfur, nitrogen) inserted along to the backbone. Also silicon forms similar materials without the need of carbon atoms, such as silicones through siloxane linkages; these compounds are thus said to be inorganic polymers. Coordination polymers may contain a range of metals in the backbone, with non-covalent bonding present. Some familiar household synthetic polymers ...
To investigate the effect of polymer molecular weight (MW) on rhBMP-2 delivery by thermoreversible polymers, four polymers with similar lower critical solution temperatures (20 degrees -22 degrees C) but different MWs were studied. Thermoreversible polymers were based on N-isopropylacrylamide (NiPAM), ethyl methacrylate (EMA), and N-acryloxysuccinimide (NASI), and had MWs of either approximately 49 kDa or approximately 400 kDa. The NASI content was either 0 or 1-1.6%. High MW polymers, irrespective of their NASI content, formed a stable gel with significantly lower water uptake and exhibited a dense micelle with average pore size smaller than the low MW polymers. NiPAM/EMA polymers without NASI did not conjugate with recombinant human bone morphogenetic protein-2 (rhBMP-2). NiPAM/EMA polymers containing NASI, however, gave conjugation with rhBMP-2. For polymers without NASI, a high MW was essential for rhBMP-2 retention when injected intramuscularly in Sprague-Dawley rats. For NASI-containing polymers,
Preface. List of Contributors.. Polymer Brushes: On the Way to Tailor-Made Surfaces (Jürgen Rühe).. 1 Growth of Polymer Molecules at Surfaces: Introductory Remarks.. 2 Coatings: From First Principles to High-Tech Applications.. 3 Surface-Coating Techniques.. 4 Surface-Attached Polymers.. 5 Polymer Brushes: General Features.. 6 Theory of Polymer Brushes.. 7 Synthesis of Polymer Brushes.. 8 Polymer Brushes as Functional Materials.. 9 Microstructured Polymer Brushes.. 10 Surface-Initiated Polymerization: The Overall Picture.. Part I Synthesis.. 1 Recent Advances in Polymer Brush Synthesis (Anthony M. Granville and William J. Brittain).. 1.1 Introduction.. 1.2 "Grafting To" Synthesis Technique.. 1.3 "Grafting From" Synthesis Technique.. 2 Polymer Brushes by Atom Transfer Radical Polymerization (Jeffrey Pyun, Tomasz Kowalewski, and Krzysztof Matyjaszewski).. 2.1 Introduction.. 2.2 Polymer Brushes on Flat Surfaces.. 2.3 Polymer Brushes from Particles.. 2.4 Molecular Brushes.. 3 Polymer Brushes by ...
Five new metal-organic coordination polymers ([Cu{sub 3}(μ{sub 2}-OH){sub 2}(atrz){sub 2}(nph){sub 2}(H{sub 2}O){sub 2}]·2H{sub 2}O){sub n} (1), ([Cu{sub 2}(μ{sub 3}-OH)(atrz)(1,2,4-btc)]·2H{sub 2}O){sub n} (2), ([Cu{sub 2}(μ{sub 3}-OH)(atrz)(1,2,4-btc)(H{sub 2}O)]·H{sub 2}O){sub n} (3), [Cu(dth){sub 0.5}(nph)(H{sub 2}O)]{sub n} (4) and [Cu(dth)(Hnip){sub 2}]{sub n} (5) [atrz=4-amino-1,2,4-triazole, dth=N,N-di(4H-1,2,4-triazole)hexanamide, H{sub 2}nph=3-nitrophthalic acid, 1,2,4-H{sub 3}btc=1,2,4-benzenetricarboxylic acid and H{sub 2}nip=5-nitroisophthalic acid] were hydrothermally synthesized and structurally characterized. Polymer 1 shows a one-dimensional (1D) chain. Polymers 2 and 3 exhibit similar tetranuclear Cu{sup II}{sub 4} cluster-based three-dimensional (3D) frameworks with the same components. Polymer 4 possesses a 3D framework with a 4{sup 12}·6{sup 3}-pcu topology. Polymer 5 displays a 3D framework with a 4{sup 4}·6{sup 10}·8-mab topology. The magnetic properties of 1-4 ...
Novel temperature- and pH-responsive ABA-type triblock copolymers, P(DEAEMA-co-MEO2MA-co-OEGMA)-b-PEG-b-P(DEAEMA-co-MEO2MA-co-OEGMA), composed of a poly(ethylene glycol) (PEG) middle block and temperature- and pH-sensitive outer blocks, were synthesized by atom transfer radical polymerization (ATRP). The composition and structure of the copolymer were characterized by 1H NMR and gel permeation chromatography (GPC). The temperature- and pH-sensitivity, micellization, and the sol-gel transitions of the triblock copolymers in aqueous solutions were studied using transmittance measurements, surface tension, viscosity, fluorescence probe technique, dynamic light scattering (DLS), zeta-potential measurements, and transmission electron microscopy (TEM). The lower critical solution temperature (LCST) of the triblock copolymer, which contains a small amount of a weak base group, (N,N-diethylamino) ethyl methacrylate (DEAEMA), can be tuned precisely and reversibly by changing the solution pH. When the copolymer
A polymer is a molecule, made from joining together many small molecules called monomers. The word "polymer" can be broken down into "poly" (meaning "many" in Greek) and "mer" (meaning "unit"). This shows how the chemical composition of a polymer consists of many smaller units (monomers) bonded together into a larger molecule. A chemical reaction bonding monomers together to make a polymer is called polymerization. Some polymers are natural and made by organisms. Proteins have polypeptide molecules, which are natural polymers made from various amino acid monomer units. Nucleic acids are huge natural polymers made up of millions of nucleotide units. Cellulose and starch (two types of carbohydrate) are also natural polymers made up of glucopyranose monomer bonded together in different ways. Rubber is a mixture of polymers. Plastics are man-made polymers. Many fibers are made of polymers. If the "units" called monomers in a polymer are all the same, then the polymer is called a "homopolymer". ...
Many pathogens that infect humans use cell surface carbohydrates as receptors to facilitate cell-cell adhesion. The hallmark of these interactions is their multivalency, or the simultaneous occurrence of multiple interactions. We have used a carbohydrate-functionalized fluorescent polymer, which displays many carbohydrate ligands on a single polymer chain, to allow for multivalent detection of pathogens. Incubation of a mannose-functionalized polymer with Escherichia coli yields brightly fluorescent aggregates of bacteria. These results show that carbohydrate-functionalized fluorescent polymers are a versatile detection method for bacteria. Future design of detectors for other pathogens only requires information on the carbohydrates bound by the organisms, which has been exhaustively reported in the literature.. ...
The work presented in this thesis concerns surface energy modification and patterning of the surfaces of conjugated polymers. Goniometry and Wilhelmy Balance techniques were used to evaluate the surface energy or wettability of a polymers surface; infrared reflectionabsorption spectroscopy (IRAS) was used to analyse the residuals on the surface as modified by a bare elastomeric stamp poly(dimethylsiloxane) (PDMS). The stamp was found to be capable of modifying a polymer surface. Patterning of a single and/or double layer of conjugated polymers on the surface can be achieved by surface energy controlled dewetting. Modification of a conjugated polymer film can also be carried out when a sample is subjected to electrochemical doping in an aqueous electrolyte. The dynamic surface energy changes during the process were monitored in-situ using the Wilhelmy balance method.. This thesis also concerns studies of conjugated polymer-based optoelectronics, including light-emitting diodes (PLEDs), that ...
The direct reaction between copper nitrate, thymine-1-acetic acid, and 4,4′-bipyridine in water leads to the formation of a blue colloid comprising uniform crystalline nanoribbons (length >1 mum; width ca. 150-185 nm; diameter ca. 15-60 nm) of a coordination polymer. The polymer displays a thymine-based structure freely available for supramolecular interactions. These nanostructures show significant selective interaction with single-stranded oligonucleotides based on adenine. Remarkably, they present low cell toxicity in three cell lines-despite the copper(II) content-and can be used as nanocarriers of oligonucleotides. These results suggest the potential of these types of nanostructures in several biological applications ...
This invention includes malleable, biodegradable, fibrous compositions for application to a tissue site in order to promote or facilitate new tissue growth. One aspect of this invention is a fibrous component that provides unique mechanical and physical properties. The invention may be created by providing a vessel containing a slurry, said slurry comprising a plurality of natural or synthetic polymer fibers and at least one suspension fluid, wherein the polymer fibers are substantially evenly dispersed and randomly oriented throughout the volume of the suspension fluid; applying a force, e.g., centrifugal, to said vessel containing said slurry, whereupon said force serves to cause said polymer fibers to migrate through the suspension fluid and amass at a furthest extent of the vessel, forming a polymer material, with said polymer material comprising polymer fibers of sufficient length and sufficiently viscous, interlaced, or interlocked to retard dissociation of said polymer fibers.
A composite is formed wherein particles of a conductive polymer are uniformly distributed within a processable non-conductive polymer. In the method of the invention, an inverted emulsion is formed by dispersing an aqueous solution of oxidant in an organic solvent comprising a host polymer and an oil-soluble surfactant. A monomer whose polymerization yields a conductive polymer which is dissolved in a solvent miscible with the organic solvent of the emulsion is then added dropwise to the emulsion with agitation. The composite is separated from the emulsion and the precipitate is washed and dried.
polymer fiber manufacturer/supplier, China polymer fiber manufacturer & factory list, find qualified Chinese polymer fiber manufacturers, suppliers, factories, exporters & wholesalers quickly on Made-in-China.com.
Polymer composites comprising a water-insoluble polymer and a water-sensitive polymer are disclosed. The water-sensitive polymer is a copolymer polymerized from one or more alkylene oxide monomers and one or more epoxy-functional monomers. The polymer composites can be used in the manufacture of articles having enhanced lubricious-when-wet properties, e.g., wet-shaving devices, and medical devices, e.g., catheters. The articles can provide enhanced retention of lubricity after repeated uses.
phdthesis{d217f1f6-5ffd-404d-8913-770a926a130e, abstract = {Most polymeric materials used today are not simple homopolymers, but consist of more than one polymer, which lead to morphologies of different length scale and shape. It is important to receive knowledge of the morphologies because the properties of the materials change depending on the structure. This thesis describes methods developed to study polymer morphologies by electron microscopy and also how to make a correct interpretation of the result. TEM (Transmission Electron Microscope) and SEM (Scanning Electron Microscope) are described for studying morphologies in PVC (polyvinyl chloride) resin, polymer blends, compatibilizer in polymer blends, latex particles, latex films and bitumen/polymer blends. Following polymer blends were studied: Carbon black filled NBR/EPDM (nitril butadiene rubber/ethylene-propylene-diene terpolymer), PP/PA (polypropylene/polyamid) Modified with SEBS-MA ...
A process for producing a substantially dry polymer particle powder. A mixture of polymerization reagents is formed from a mixture of at least one monomer source and a solvent selected from the group consisting essentially of water and organic solvents and an initiator source. The mixture of polymerization reagents is sprayed into a heated, controlled atmosphere, forming droplets of the mixture which are allowed to fall through the heated, controlled atmosphere for a sufficient period of time to obtain a desired degree of polymerization. The solvent is continuously evacuated from the atmosphere during the polymerization process.
Zinc-porphyrin dye molecules were incorporated into the backbone of a conjugated polymer material by a method, which allowed for the incorporation of only one zinc-porphyrin dye molecule into the backbone of each conjugated polymer molecule. The electronic properties of the homopolymer were established using ultraviolet photoelectron spectroscopy (UPS) for the determination of the electronic energy levels and the injection barrier for holes into the valence band. Pulse radiolysis time resolved microwave conductivity (PR-TRMC) was used to determine the sum of charge carrier mobilities. Electroluminescent devices of the homopolymer itself and of the zinc-porphyrin containing polymer were prepared and the nature of the electroluminescence was characterized. The homopolymer segments were found to optically pump the emission of the zinc-porphyrin dye moities. The homopolymer exhibits blue-green emission and the zinc-porphyrin linked homopolymers emit near-infrared/infrared light. This was ...
In this study, the outstanding ability of the coordination polymer [Pt2(nBuCS2)4I]n (nBu = n-butyl) (1) to reversibly self-organize from solution was demonstrated. This feature allowed us to generate highly electrical conductive structures located upon demand on technologically relevant surfaces, by easy-to-
Wagner, B. D., McManus, G. J., Moulton, B., & Zaworotko, M. J. (2002). Exciplex fluorescence of {[Zn(bipy)(1.5)(NO3)(2)}]center dot CH3OH center dot 0.5pyrene}n: a coordination polymer containing intercalated pyrene molecules (bipy=4,4 -bipyridine). Chemical Communications, (18), 2176-2177 ...
Using bifunctional organic ligand 5-(4-imidazol-1-yl-phenyl)-2H-tetrazole (HL) and different aromatic carboxylates as secondary ligands, four novel metal-organic coordination polymers, [Zn(L)(1,4-bdc){sub 0.5}] (1), [Zn{sub 1.5}(L)(2,5-pydc)] (2), [Zn(HL)(1,2,4,5-btec){sub 0.5}] (3), and [Cd(HL)(1,2,4,5-btec){sub 0.5}] (4) (1,4-bdc, 1,4-benzenedicarboxylate; 2,5-pydc, 2,5-pyridinedicarboxylate; 1,2,4,5-btec, 1,2,4,5-benzenetetracarboxylate) have been successfully synthesized and analyzed. Compound 1 features the 2D [Zn(L)]{sub n} layers built by μ{sub 3}-L bridging ligands and Zn(II) ions, which are further linked by pillared 1,4-bdc{sup 2−} ligands to form a 2-fold interpenetrating dmc framework. The 3D network of compound 2 can be simplified as a rare 2-nodal (3,6)-connected rtl (rutile) topology. Compound 3 possesses a 2D layer structure which is accomplished by connecting ladder-chains to L ligands. Compound 4 exhibits 2D [Cd(1,2,4,5-btec)] layers with infinite Cd-O-Cd rods and the ...
The book also provides the reader with associated challenges and existing application problems of SMP. This could assist the reader to focus more on these issues and further exploit their knowledge to look for innovative solutions.
Sirrus, Inc., a developer of novel monomers and crosslinkers, welcomes Alexander Polykarpov, PhD, as its new Director of Polymer Synthesis. Dr. Polykarpov will be responsible for the companys polymer synthesis efforts, leading the development of hybrid, crosslinked and homopolymers based on Sirrus patented methylene malonate technology.. "Alex has a unique combination of polymer synthesis and application development experience," says Jeff Uhrig, Sirrus CEO. "Accordingly, he is uniquely qualified to design polymer architectures that will address commercial opportunities.". Dr. Polykarpov holds a PhD in Organic Photochemistry from Bowling Green State University and brings more than 25 years of polymer science experience to Sirrus. Most recently, he served as Polymer Lab Manager at AkzoNobel Coatings Inc., where he led a research team developing new polymer platforms for can and coil coatings. Dr. Polykarpovs research portfolio includes seven issued patents.. Since the acquisition of Sirrus by ...
Presenting a completely new approach to examining how polymers move in non-dilute solution, this book focuses on experimental facts, not theoretical speculations, and concentrates on polymer solutions, not dilute solutions or polymer melts. From centrifugation and solvent dynamics to viscosity and diffusion, experimental measurements and their quantitative representations are the core of the discussion. The book reveals several experiments never before recognized as revealing polymer solution properties. A novel approach to relaxation phenomena accurately describes viscoelasticity and dielectric relaxation and how they depend on polymer size and concentration. Ideal for graduate students and researchers interested in the properties of polymer solutions, the book covers real measurements on practical systems, including the very latest results. Every significant experimental method is presented in considerable detail, giving unprecedented coverage of polymers in solution ...
Decision III International scientific conference «Modern trends in chemistry and technology of polymer materials». SYSTEMS ANALYSIS, AUTOMATION AND PROCESS CONTROL TEXTILE AND LIGHT INDUSTRY. A.G. Makarov, N.V. Pereborova, M.A. Egorova, D.S. Ljodov, K.N. Busygin, A.S. Konovalov. Methodology spectral modeling of deformation-relaxation processes of polymer material. Development and improvement of methods of settlement prediction of stress-strain states of polymer materials in the scope of non-destructive mechanical effects caused by expanding their use in technical products and is inextricably linked with the objectives of the comparative analysis of the properties of materials, studies the relationship of properties to the structure, with targeted technological control properties with the prediction of short-term and long-term mechanical stress.. Keywords: creep, viscoelasticity, plasticity, elasticity, deformation, polymeric materials, forecasting, recovery processes.. E.Yu. Chulanov, G.Yu. ...
Polymer Composites and Polymeric Materials for Energy Management and Occupant Safety by Society of Automotive Engineers, 9780768003802, available at Book Depository with free delivery worldwide.
Study on Structure Development of Polymer Blends under the Continuous Change of Quench DepthStudy on Structure Development of Polymer Blends under the Continuous Change of Quench Depth ...
Current Applied Polymer Science publishes expert review articles and thematic issues in all applied aspects of polymer science including composites, nano polymeric composites and molecular composites, It includes biodegradable polymers, polysaccharides and other natural polymers, membranes, energy conversion and storage, conducting polymers, biomedical implants, and synthetic polymers. It will cover miscible and compatible polymer blends, amorphous and semi-crystallline polymer blends, rubber toughened and elastomeric blends, self-reinforced blends, interpenetrating networks and all other aspects of polymer science as applied to various fields of pharmaceuticals, industrial manufacture, health, agriculture, new materials and other areas.
Current Applied Polymer Science publishes expert review articles and thematic issues in all applied aspects of polymer science including composites, nano polymeric composites and molecular composites, It includes biodegradable polymers, polysaccharides and other natural polymers, membranes, energy conversion and storage, conducting polymers, biomedical implants, and synthetic polymers. It will cover miscible and compatible polymer blends, amorphous and semi-crystallline polymer blends, rubber toughened and elastomeric blends, self-reinforced blends, interpenetrating networks and all other aspects of polymer science as applied to various fields of pharmaceuticals, industrial manufacture, health, agriculture, new materials and other areas.
Compounds and metal complexes comprising a polycyclic, fused ring ligand or inertly substituted derivative thereof having up to 60 atoms other than hydrogen, said ligand comprising at least: (1) a cyclopentadienyl ring, (2) a 6,7,or 8 membered ring other than a 6-carbon aromatic ring, and (3) an aromatic ring, with the proviso that said 6, 7, or 8 membered ring (2), is fused to both the cyclopentadienyl ring (1), and the aromatic ring (3), polymerization catalysts, a process to prepare the novel compounds and complexes, and olefin polymerization processes using the same are disclosed.
An apparatus for manufacturing a polymer fiber shell from liquefied polymer is provided. The apparatus includes: (a) a precipitation electrode being for generating the polymer fiber shell thereupon; (b) a dispenser, being at a first potential relative to the precipitation electrode so as to generate an electric field between the precipitation electrode and the dispenser, the dispenser being for: (i) charging the liquefied polymer thereby providing a charged liquefied polymer; and (ii) dispensing the charged liquefied polymer in a direction of the precipitation electrode; and (c) a subsidiary electrode being at a second potential relative to the precipitation electrode, the subsidiary electrode being for modifying the electric field between the precipitation electrode and the dispenser.
The report provides a comprehensive overview of the global water soluble polymers market and presents insights into the factors driving and restraining the market. To present a holistic overview of the market, the report also studies the prevailing competitive landscape of the global water soluble polymers market. BASF SE, Kemira, Kuraray, SNF, and Ashland Inc. are the key vendors operating in the market. It is interesting to note here that over 70% of the highly consolidated global water soluble polymers market is held by the top three companies. The leading companies operating in the market are profiled in the report to with an aim to analyze the markets prevailing competitive landscape ...
El departamento ORAFOL Advanced Polymer Films ofrece soluciones de láminas y películas plásticas de gran calidad. Estos productos se utilizan en mercados tan variados como artes gráficas, medicina, aeroespacial y automoción, para satisfacer todos los requisitos de extrusión.. La línea ORAFOL Advanced Polymer Films incluye las familias de láminas y películas extruidas de gran calidad RowTec® Polycarbonate Films (PC), SolaTuf® Acrylic Films (AC) y RowLux® Multi-lensed Polycarbonate Films (PC).. ORAFOL Europe adquirió Rowland Technologies Inc. de Wallingford, Connecticut (EE.UU.) en 2017. Rowland Technologies es un fabricante especializado en películas poliméricas de gran calidad con un proceso exclusivo de extrusión y técnicas de mecanización propias patentadas. La excelencia técnica de Rowland combinada con la red internacional de distribución de ORAFOL componen el recién creado departamento Advanced Polymer Films, la elección natural para películas de calidad ...
Following on in the tradition of events jointly organized by the Donostia International Physics Center (DIPC, San Sebastian, Spain), the Jülich Centre for Neutron Science (JCNS, Forschungszentrum Jülich, Germany) and the European Network of Excellence SoftComp, a workshop on "Functional Polymers" is being organized to take place in spring 2018 in San Sebastian, Spain.. The workshop focuses on advanced polymer materials, and aims to bring together physicists and chemists who are interested in novel polymer nanocomposites, polymers functionalized with supramolecular groups and functional soft nano-objects ...
Following on in the tradition of events jointly organized by the Donostia International Physics Center (DIPC, San Sebastian, Spain), the Jülich Centre for Neutron Science (JCNS, Forschungszentrum Jülich, Germany) and the European Network of Excellence SoftComp, a workshop on "Functional Polymers" is being organized to take place in spring 2018 in San Sebastian, Spain.. The workshop focuses on advanced polymer materials, and aims to bring together physicists and chemists who are interested in novel polymer nanocomposites, polymers functionalized with supramolecular groups and functional soft nano-objects.. ...
Small-molecule dynamics and mechanisms underlying the macroscopic mechanical properties of coordinatively cross-linked polymer networks.s profile, publications, research topics, and co-authors
Polymer materials are widely used in biocompatible, ion-sensing and electrical devices, because of their good scalability, mechanical strength, flexibility, and most important of all, ease of processing. As an alternative to the more elaborate processes of vacuum evaporation and deposition of inorganic and organic molecular materials, manufacturers could eventually use ink-jet printers or spin-coater, for example, to deposit polymers on a variety of substrates. In addition, one of advantages of polymer materials is possibility of versatile application by means of simple synthesis. The function of polymer can be changed by addition of specific molecules to polymer backbone or side chain. In particular, brush block polyvinyls are representative electrically useful materials for various fields. In this research, the synthesis and characterization of new types of diblock copolymers are composed of electron transferring and hole transferring (carbazole, cyano, and introduction to functional groups ...
A method is disclosed for the de novo synthesis of polypeptide-containing polymers. This disclosure also includes a description of, and a method for the preparation of, a class of polymerizable compounds used in the synthesis of polypeptide-containing polymers. These polymerizable compounds are chemical conjugates prepared by covalent linkage of polymerizable organic monomers with specific polypeptides. Soluble monomer/polypeptide conjugates can be polymerized in solution with additional nonderivatized organic monomers to form desired polypeptide-containing polymers. The amount and composition of monomer and monomer/polypeptide conjugates can be varied in order to provide control of (a) molecular spacing, steric accessibility, and number of polypeptide molecules that are integrally incorporated into the polymer backbone, and (b) the chemical and physical structure of the polymer itself. This enables the specific tailoring of polypeptide-containing
Until the mid 90s, free radical polymerization (FRP) was characterized by producing polymers with high average molecular weig hts (1×10 5-1×106) since the beginning of polymerization, index of polidispersity (PDI) greater than 1.5 and wide molecular weight distribution (MWD). When necessary to produce polymers with more defined structure, it was usually used anionic polymerization, which is capable to produce polymers with narrow molecular weight distribution and PDI around 1.0 (1.1-1.2). The ionic polymerization, however, needs to be held in a high degree of purity and in the absence of inhibitors, what make the ionic polymerization expensive and not very practical from the industrial point of view. A promising alternative to ionic polymerization has been the living radical polymerization (LFRP), which is much more robust to the impurities and kind of solvent and it is able to produce polymers with polidispersity close to one. Nevertheless, the LFRP presents lower polymerization rates ...
Generally, high-temperature applications require ceramic dielectrics, but these are heavy and brittle, according to Penn State professor of materials science and engineering, Qing Wang, who led the research. Polymer dielectrics are lighter, but have tended to degrade in performance or melt at high temperatures, necessitating a cooling system, which adds further weight and complexity.. Wang and his team used boron nitride, a two-dimensional substance similar in structure to graphene which has been shown to have dielectric properties, in the form of nanosheets about 2nm thick and 400nm across as the active agent in a cross-linked polymer nanocomposite with benzenecyclobutene, a polymer used in electronics. The composite can be made by just mixing the boron nitride and the polymer precursor, then curing with heat or light to create the cross-linked structure. Because the nanosheets are so small, the polymer remains flexible. The team claims in a paper in Nature that the polymer can be ...
Shouke Yan, and Le Ma. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China. The recrystallization behavior of carbon-coated preoriented polymer thin films was studied by means of transmission electron microscopy combined with electron diffraction and spectroscopy. It was found that vacuum evaporated carbon layer can keep the molecular chain orientation of pre-oriented polymer thin films. This demonstrates the existence of strong fixing effect of vacuum evaporated carbon layers on the surface layer of the polymer films, which prevents the relaxation of surface extended macromolecular stems in the crystals or at least from a complete relaxing during high-temperature melting. The fixed surface molecular chains have in turn induced the oriented recrystallization of the thin polymer molten layer. It was further found that the crystal structures and morphologies can be well controlled through regulating the crystallization ...
Polymer chemistry, polymer synthesis, polymer physics, polymer physical chemistry, polymer materials, polymer self-assembly, supramolecular polymer, polymer surface interface, polymer nanomaterials, energy polymer materials, biomedical polymer, ecological environment polymer, optoelectronic polymer, polymer processing and high grade Hydrogel, Zhang Xi, macromolecule, macromolecule Journal
A moisture-absorbing polymeric material is disclosed which consists of a combination of a thermoplastic material with an absorbing agent. The thermoplastic material is chosen such that when the absorbing agent is added to the thermoplastic material in the molten state and subsequently formed into a product, the absorbing agent tends to migrate towards the surface of the moisture-absorbing polymeric material to form a migration zone, wherein the absorbing agent is more highly concentrated in the surface of the polymer material than towards the interior.
IPPT PAN. Electrospinning of conjugated polymer nanofibers: research challenges and applications. Conjugated polymers are a class of organic macromolecules with large π-conjugated polymer chains due to a backbone chain of alternating double- and single-bonds. The highly electron-delocalized structures generated by the overlapping of p-orbitals create systems with fascinating electronic and optical properties. Conjugated polymer nanomaterials have been shown to be promising for advanced organic electronic, photovoltaic and biomedical applications.. Electrospinning is the most efficient technique for elongating and aligning polymer chains to form nanofibers with a well-defined structure. This technique is particularly interesting in order to fabricate continuous polymer 1D nanostructures with controllable composition, structure and properties. Chemical and physical properties of conjugated polymer nanofibers could be modulated by controlling their hierarchical structure by way of electrospinning ...
IPPT PAN. Electrospinning of conjugated polymer nanofibers: research challenges and applications. Conjugated polymers are a class of organic macromolecules with large π-conjugated polymer chains due to a backbone chain of alternating double- and single-bonds. The highly electron-delocalized structures generated by the overlapping of p-orbitals create systems with fascinating electronic and optical properties. Conjugated polymer nanomaterials have been shown to be promising for advanced organic electronic, photovoltaic and biomedical applications.. Electrospinning is the most efficient technique for elongating and aligning polymer chains to form nanofibers with a well-defined structure. This technique is particularly interesting in order to fabricate continuous polymer 1D nanostructures with controllable composition, structure and properties. Chemical and physical properties of conjugated polymer nanofibers could be modulated by controlling their hierarchical structure by way of electrospinning ...
Conjugated polymer actuators can be operated in aqueous media, which makes them attractive for laboratories-on-a-chip and applications under physiological conditions. One of the most stable conjugated polymers under these conditions is polypyrrole, which can be patterned by means of standard photolithography. Polypyrrole-gold bilayer actuators that bend out of the plane of the wafer have been microfabricated in our laboratory. These can be used to move and position other microcomponents. Here we review the current status of these microactuators, outlining the methods used to fabricate them. We describe the devices that have been demonstrated as well as some potential future applications. ...
article{1d639226-5cf7-4c92-836b-2e489f332dcf, abstract = {Polymer adsorption of uncharged homopolymers onto planar surfaces has been investigated by employing a coarse-grained bcad-spring polymer model using simulation techniques. Polymer solutions of two different densities and polymers of two different Contour lengths have been examined. The dynamics of the adsorption process appearing in systems composed of a polymer Solution placed near attractive. but initially polymer-free, surfaces were determined by Brownian dynamics simulations and equilibrium properties of corresponding systems by Monte Carlo simulations. The properties of the systems have been analyzed by monitoring the number of adsorbed polymers, bead density profiles, time and frequency of polymer attachments, spatial extension of polymers perpendicular and parallel to the surface, and configurational characteristics. Initially, the polymers diffuse toward the Surfaces, and at shorter distances the attractive Surface potential ...
Bovine Serum Albumin (BSA) and lysozyme have been chemically transformed into macroinitiators for the synthesis of fluorescent bioconjugates by living radical polymerization. A new fluorescent monomer based on rhodamine B has been synthesized and incorporated Bovine Serum Albumin (BSA) and lysozyme have been chemically transformed into macroinitiators for the synthesis of fluorescent bioconjugates by living radical polymerization. A new fluorescent monomer based on rhodamine B has been synthesized and incorporated into the polymer backbone of the bioconjugate by copolymerization. This provides a new strategy for the synthesis of fluorescent bioconjugates with improved traceability in biological environments, during biomedical assays. [+] [-] ...
The inline polymer system is designed to be used with liquid polymer for the continuous delivery of a blended dilute polymer solution. The polymer pump used in the MixCat system is a peristaltic type pump, which is relatively trouble free. This pump will pass polymer
In many instances a polymer molecule may be described using the same terminology used to describe any molecule. Molecular structure may be described in terms of bond lengths and angles; mass may be described in terms of molecular weight. However, the size and complexitiy of polymer molecules often require the use of specialized terminology to precisely describe the nature of the monomer(s) and how those monomers are connected or arranged. The mass of a polymer molecule may be described using standard conventional for molecular or molar mass. This molecular weight, expressed in Daltons, is used frequently to describe complex biopolymers, such as proteins. An altnerate expression for molecular mass is the degree of polymerization (DP), essentially the number of monomer units which comprise the polymer or block. DP is especially convenient for homopolymers or block copolymers, and is used frequency when describing the extent of a polymerization reaction. Laboratory syntheses tend to produce polymer ...
The present invention provides dual catalyst systems and polymerization processes employing these dual catalyst systems. The disclosed polymerization processes can produce olefin polymers at higher production rates, and these olefin polymers may have a higher molecular weight and/or a lower melt index.
This book reflects the recent progress made in the field of scattering in polymers. A wide range of scattering studies on different polymer systems, including block copolymers, semicrystalline polymers, complex fluids, multicomponent systems, polymeric surfaces, and polymer processing are included, as well as new experimental techniques and theoretical treatments. This volume provides a comprehensive reference for those researchers who need to know how scattering techniques can be used to tackle different polymer problems, and is ideal for graduate polymer scientists studying scattering techniques.
This book reflects the recent progress made in the field of scattering in polymers. A wide range of scattering studies on different polymer systems, including block copolymers, semicrystalline polymers, complex fluids, multicomponent systems, polymeric surfaces, and polymer processing are included, as well as new experimental techniques and theoretical treatments. This volume provides a comprehensive reference for those researchers who need to know how scattering techniques can be used to tackle different polymer problems, and is ideal for graduate polymer scientists studying scattering techniques.
Buy Water Purifying Chemicals Cationic Polymer Blend Sudfloc 3870 for Drinking Water Treatment direct from Water Purifying Chemicals of China Factory that provide Latest Water Purifying Chemicals - waterpurifyingchemicals.
R. Y. Zhao, S. Yang, and E. Q. Chen. Department of Polymer Science and Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China. Recently, we are interested in side-chain liquid crystalline (LC) polymers bearing the hemiphasmid side-chain that contains a rod-like mesogen linked with a half-disk end group [1-3]. We found that they could self-organize into the hexagonal and/or rectangular columnar LC phase when the size of flexible tails on the half-disk was properly chosen and the dimension of columnar lattice could approach to 10 nm easily. It is identified that the supramolecular column in the columnar phase shall contain several chains (e.g., ~5 chains) laterally associated together rather than a single chain. This "multi-chain column" provides a new type of physical crosslinking. Namely, within the confined space of the column the backbones and pendant groups of the polymer can get entangled. Using ...
Growing miniature materials demand for several applications in end-use industries such as electronics, telecom, automotive and medical is anticipated to drive the global polymer microinjection molding market growth over the next five years. Polymer microinjection molding process is used to manufacture micro sized tools and parts through a machine comprising fine resolution, injection pressure, and high speed specific molds as per requirements. Some primary polymers used for the process include polymethyl methacrylate (PMMA), polyether ether ketone (PEEK), polyoxymethylene, polyethylene, polylactic acid and liquid crystal polymer. Thermoplastics dominated the global polymer microinjection molding market accounting for over 64% in 2013. Increasing demand for micro materials in electronic and medical industry is expected to bolster the global market over the forecast period. Shifting focus towards substituting polymers comprising phthalate with thermoplastics is anticipated surge the demand for ...
TY - JOUR. T1 - Evaluation of water uptake and mechanical properties of blended polymer films for preparing gas-generated multiple-unit floating drug delivery systems. AU - Chen, Ying Chen. AU - Lee, Lin Wen. AU - Ho, Hsiu O.. AU - Sha, Chen. AU - Sheu, Ming Thau. PY - 2012/10. Y1 - 2012/10. N2 - Among various strategies of gastroretentive drug delivery systems (DDSs) developed to prolong the gastric residence time and to increase the overall bioavailability, effervescent multiple-unit floating DDSs (muFDDSs) were studied here. These systems consist of drug (losartan)- and effervescent (sodium bicarbonate)-containing pellets coated with a blended polymeric membrane, which was a mixture of gastrointestinal tract (GIT)-soluble and GIT-insoluble polymers. The addition of GIT-soluble polymers, such as hydroxypropyl methylcellulose, polyethylene glycol (PEG) 6000, PEG 600, and Kollicoat® IR, greatly increased the water uptake ability of the GIT-insoluble polymers (Eudragit® NE, RS, and RL; ...
Scientists at UIUC, the University of Illinois at Urbana-Champaign, have recently developed a very unique polymer material that has the ability to heal itself over and over again when it cracks. The new polymer is designed to be like human skin. When human skin is cut, blood vessels from the inner layer deliver nutrients to the site of injury...
A novel fluorescent polymer that lights up when it makes contact with mercury that may be present in fish could be used to reduce the sale and consump
Contemporary reports by Polish authors on the application of mass spectrometric methods for the elucidation of the subtle molecular structure of biodegradable polymers and their degradation products will be presented. Special emphasis will be given to natural aliphatic (co)polyesters (PHA) and their synthetic analogues, formed through anionic ring-opening polymerization (ROP) of b-substituted b-lactones. Moreover, the application of MS techniques for the evaluation of the structure of biodegradable polymers obtained in ionic and coordination polymerization of cyclic ethers and esters as well as products of step-growth polymerization, in which bifunctional or multifunctional monomers react to form oligomers and eventually long chain polymers, will be discussed. Furthermore, the application of modern MS techniques for the assessment of polymer degradation products, frequently bearing characteristic end groups that can be revealed and differentiated by MS, will be discussed within the context of ...
Floreons patented polymer formulation yields PLA-based polymer blends suitable for thermoformed and injection-molded packaging that also show promise for film and blow-molding operations.
The present invention relates to a multiple layer composite material and to a method for producing the same. Said multiple layer composite material has at least one layer of cement-bound concrete and at least one layer of polymer-bound concrete. The transition between adjacent layers of cement-bound concrete and polymer-bound concrete has at least the material strength of the less stable one of the concrete layers adjoining the transition. The layer of polymer-bound concrete allows the diffusion of water vapor, but does not allow liquid water to penetrate. The multiple layer composite material can be produced completely in an aqueous system.
Polymers are huge macromolecules composed of repeating structural units. While polymer in popular usage suggests plastic, the term actually refers to a large class of natural and synthetic materials. Due to the extraordinary range of properties accessible, polymers have come to play an essential and ubiquitous role in everyday life - from plastics and elastomers on the one hand to natural biopolymers such as DNA and proteins on the other hand. The study of polymer science begins with understanding the methods in which these materials are synthesized. Polymer synthesis is a complex procedure and can take place in a variety of ways. This book brings together the "Who is who" of polymer science to give the readers an overview of the large field of polymer synthesis. It is a one-stop reference and a must-have for all Chemists, Polymer Chemists, Chemists in Industry, and Materials Scientists ...
The present invention provides polymers (e.g., elastomeric citric acid polymers) and methods of making and using these polymers (e.g., as a biologically active molecule delivery platform). In certain embodiments, the polymer has adsorbed biologically active molecules. In particular embodiments, the polymer comprises pores that are between about 7 and 15 nanometers in diameter. In other embodiments, the polymer comprises poly(1,8 octanediol-co-ctric acid). In certain embodiments, the polymers are made by employing polyethylene glycol dimethyl ether (PEGDM).
There attend fuzzy experiences that could use this Water Soluble Polymers: Proceedings of a Symposium held by the American Chemical Society, Division of Organic Coatings and Plastics Chemistry, developing continuing a Indian refugee or cookie, a SQL turnout or various days. What can I protect to take this? You can be the uniform ANALYST to test them take you were led. Please access what you refused signing when this V captured up and the Cloudflare Ray ID omitted at the interest of this card. The invalid authority had while the Web noise were using your origin. Please continue us if you request this is a company design. You here love function Other. due & may so prepare. practically selective PDF to set free Secession. This Water Soluble Polymers: Proceedings of a Symposium held by the American Chemical Society, Division of Organic Coatings and Plastics Chemistry, in New York City on contains a different registration to the displaying Congresses for honest Late colleagues, the latest percentage ...
The adsorption of relatively large polymers onto the surfaces of small particles is, potentially, fundamentally different from the normal case where the substrate is assumed to be locally flat. In a concd. dispersion of small particles, the sepn. of the particles is such that a large polymer may bridge the gap between two adjacent surfaces dependent on the surface coverage and the manner in which the adsorption sample is prepd. In this paper, we present data from small-angle neutron scattering (SANS) of high mol. wt. poly(ethylene oxide) (PEO) adsorbed onto colloidal silica and solvent relaxation studies of a smaller PEO sample adsorbed onto a range of different sized silica particles. The effects of particle size and concn. and polymer mol. wt. and concn. have been studied. Mol. dynamics (MD) simulations illustrate the importance of the relative sizes of the adsorbent and adsorbate. ...
James Madison Tactical (JMT) introduces the JMT 80%-a superior polymer/fiber lower receiver. JMT has incorporated new polymer/fiber material technology and manufacturing processes for enhanced durability, strength and reliability. The lower also comes with a three-piece machining jig with every order, which allows the enduser to machine the lower receiver with precision using simple tools. Features include reinforced fire control pocket, overmolded metal threaded insert for pistol grip screw, reinforced buttstock mount, enhanced oversize triggerguard, reinforced flared magazine well, forward magazine finger grate, enhanced gusseted forward upper receiver tabs. Introductory pricing is $119.00. Visit jamesmadisontactical.com for more information.. ...
This phase IV trial compared the efficacy and tolerability of a biodegradable polymer and a polymer-free sirolimus-eluting stent system with a permanent polymer
Heparin Mimicking Polymers are synthetic compounds that possess similar characteristics to heparin, that is it can be used clinically as an anticoagulant. These compounds like heparin possess a negative charge density that allows it to interact and inhibit the coagulation process. Glucose or mannose-contain n-alkyl urea peptoid oligomer, glucose modified diamine with pedant monosaccharides are examples of heparin mimicking polymers. Heparin mimicking polymers can also be used to create biomaterials for surgical application such as pacemakers, stents, etc. Heparin is widely used as a clinical anticoagulant however, it possesses drawbacks creating a need for synthetic heparin mimicking polymers. Events such as the 2008 heparin contamination event, and mad cow disease further enhance the new demand for more robust anticoagulants. Additionally prolonged use of heparin results in heparin induced thrombocytopenia. Three aspects of synthetic mimicking polymers are currently focused on: mimicking ...
Page contains details about Si nanoparticle/β-cyclodextrin polymer blend . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
DIN 54900-2 : German Language - TESTING OF THE COMPOSTABILITY OF POLYMERIC MATERIALS - PART 2: EVALUATION OF THE COMPLETE BIODEGRADABILITY OF POLYMERIC MATERIALS IN LABORATORY TESTS
ROHMs chip tantalum capacitors (TCTO series) ,encapsulating the conductive polymer for cathode into bottom surface electrode stracture, drastically lower theESR. ...
Since last decade, momentous development has been made in the biomedical field. However, the contribution of polymer hydrogels as drug delivery carrier cannot be ignored. Crosslinking of natural and synthetic polymer has established promising characteristics in stimuli sensitive hydrogels for targeted drug delivery application. In this work, we synthesized N-succinyl chitosan and characterized via Fourier transform infrared (FTIR) spectroscopy, Nuclear magnetic resonance (NMR) spectroscopy, X-ray diffraction (XRD), and differential scanning calorimetry (DSC). Then, we synthesized N-succinyl chitosan-g-Poly (acrylamide-co-acrylic acid) hydrogel via chemical crosslinking of N-succinyl chitosan, acrylamide and acrylic acid. Crosslinking was performed using free radical mechanism. Here, N, N-methylenebisacrylamide (MBA) and ammonium persulfate (APS) were used as crosslinking agent and initiator, respectively. The hydrogels were synthesized by varying the concentration of monomers, initiator, and ...
Polymer Properties at Room and Cryogenic Temperatures by Gunther Hartwig available in Hardcover on Powells.com, also read synopsis and reviews. Most descriptions of polymers start at room temperature and end at the melting point. This textbook...
Computational Modeling of Polymer Composites: A Study of Creep and Environmental Effects details the development of polymeric materials and their use in smart materials and composite structures in aerospace and automotive industries. Based on the authors work during the past 30 years, this book provides a strong understanding of the theories and associated finite element life-prediction models for elastic and viscoelastic response of polymers and polymer composites in aggressive environments. The subject is an interdisciplinary one where chemists, material scientists, and chemical, mechanical, and structural engineers contribute to the overall product. Books on polymer composites are usually of three types: material science, mechanics, and computational. This book combines mechanics of materials with the computational element. The authors suggest an introductory course on mechanics of materials to cover all bases. The book begins with mathematical preliminaries, equations of anisotropic ...
Explores relationships between spectroscopic findings and physical properties of polymers. Thirty-five chapters are divided into six sections covering fundamental concepts in FT-IR, FT-Raman, fluorescence spectroscopy and FT-Mass Spectrometry of polymers; crystalline polymers and copolymers; surfaces and interfaces of polymers; spectroscopic approaches to polymers in solutions and polymer networks; spectroscopy combined with thermally induced processes in polymers; and polymer analysis and surface modifications using non-conventional energy sources. Includes tutorial chapters designed to assist newcomers to the field.Urban, Marek W. is the author of Structure-Property Relations in Polymers: Spectroscopy and Performance, Vol. 23 with ISBN 9780841225251 and ISBN 0841225257. [read more] ...
The photoconductive range of a photoconductive polymer can be extended to include longer wavelengths, and/or the photo-induced discharge rate of a photoconductive polymer can be increased by incorpora
By continuing to browse this site you agree to us using cookies as described in About Cookies Notice: Wiley Online Library is migrating to a new platform powered by Atypon, the leading provider of scholarly publishing platforms. The new Wiley Online Library will be migrated over the weekend of February 24 & 25 and will be live on February 26, 2018. For more information, please visit our migration page: http://www.wileyactual.com/WOLMigration/. Remove maintenance message ...
Results of theoretical and experimental investigations, devoted to the analysis and optimization of optoelectronic image formation devices (IFD) on the basis of deformable polymer films (DPF) at the expense of choice of the polymer material rheology, electric field distribution in DPF by means of electrode raster and heat deformation regime is presented. For DPF structure investigations the tunnel electron microscopy technique has been used ...
This volume is the first systematic review of surfactant-modified, water-soluble polymers. The authors, representing leaders in their fields, offer practical information about associative thickeners and polymer surfactants, including spectroscopic and rheological analysis of these water-soluble polymers in aqueous solutions. In addition, aqueous gels of varying chemical types are studied with respect to their properties in numerous applications. Among the topics covered are: aqueous gels; surfactant-modified, water-soluble polymers; polyelectrolyte synthesis; elongational viscosity; and fluorescence phenomena of water-soluble polymers.
Polymers are large molecules made of a series of components linked together with chemical bonds. Polymers can be made of natural or synthetic components. Combinations of specific polymers make substances that bounce when applied with force to a solid surface. One example of this phenomenon is bouncing polymer balls.
Four main classes of biodegradable polymers are analyzed in this report, polylactic acid (PLA), starch-based polymers, synthetic biodegradable polymers, such as aromatic aliphatic co-polyesters, and polyhydroxyalkanoates (PHA). The report analyses their key performance properties, applications development, market drivers and future prospects. Each product section also contains an estimate of market size by world region and end use market, plus forecasts to 2010. There is also an analysis of key suppliers and their products.
Electrically conducting polymers induce specific cellular responses at the molecular level. One of the crucial limitations of the use of conducting polymers in tissue engineering is their inability to degrade. The incorporation of conductivity into degradable polymers to obtain materials that are both electroactive and degradable is therefore highly anticipated. Architecture plays an important role in the performance of polymers. To be able to achieve the optimal mechanical, degradation, thermal and biological properties for a particular biomedical application, it is desirable to promote architectural diversity.. In the first part, by combining the electroactivity of conducting polymers and the degradability of aliphatic polyesters, we have designed and synthesized a series of linear, star-shaped, hyperbranched, and crosslinked degradable and electrically conducting polymers and hydrogels based on polylactide (PLA), polycaprolactone (PCL), and aniline oligomers such as aniline trimer, aniline ...
The combination of selective irradiation of polymer materials with photons to create active radical species with a subsequent graft polymerization reaction is a unique technique to produce micro- and nanostructured polymer materials. A key feature of the technology is the possibility to combine the properties of a polymer substrate in precisely defined regions with properties of the grafted materials, resulting e.g.
Polymers investigated as environmentally friendly plastics can be divided into three groups: First, biodegradable and compostable polymers (BDP) from renewable resources which could be used for high volume applications in packaging; from this group, polyhydroxy butyrate (PHB) and polylactic acid (PLA) have been investigated. By blending of various BDPs, versatile properties of the blends were achieved from stiff and brittle materials up to flexible film-forming materials. The main contribution to general knowledge consists in a development of extremely efficient compatibilizing system enabling to mix different polymers, to add plasticizers resulting in significant broadening of properties, and to add high amounts of cheap ingredients, especially starch (in thermoplastic form) leading to a decrease in price down to the level competitive with polyolefins. Second, biodegradable polymers produced from fossil resources, where the most important are polycaprolactone and Ecoflex (copolyester of glycol ...