Covalent polymers. Medical search. Frequent questions

The term polyimine can also be found occasionally in covalent organic frameworks. (wikipedia.org)
By developing metallophthalocyanines and diimides as electron-donating and -accepting building blocks, herein, we report the construction of new electron donor-acceptor covalent organic frameworks (COFs) with periodically ordered electron donor and acceptor π-columnar arrays via direct polycondensation reactions. (ewha.ac.kr)
Berkeley Lab researchers have demonstrated the first soluble single-layer 2D honeycomb supramolecular organic framework that combines the ordering and porous features of metal-organic frameworks with the solubility of supramolecular polymers. (scitechdaily.com)
Researchers develop methods for producing artificial muscles with polymer covalent organic frameworks (polyCOFs). (britannica.com)
Exceptional electron conduction in two-dimensional covalent organic frameworks. (mpg.de)
Polymer chemists have synthesized materials with intrinsic, microscale porosity that are well suited for reusable gas and liquid separations because of their robust, ladder-like frameworks. (sciencedaily.com)

Recent developments in dynamic covalent polymers consisting of reversible covalent bonds are introduced. (elsevierpure.com)
In addition, self-healing polymers based on reversible covalent bonds are mentioned. (elsevierpure.com)
These are polymer materials that are crosslinked via dynamic covalent bonds. (wikipedia.org)
Özdemir, E, Thirion, D & Yavuz, CT 2015, ' Covalent organic polymer framework with C-C bonds as a fluorescent probe for selective iron detection ', RSC Advances , vol. 5, no. 84, pp. 69010-69015. (edu.sa)
Supramolecular chemistry, aka chemistry beyond the molecule, in which molecules and molecular complexes are held together by non-covalent bonds, is just beginning to come into its own with the emergence of nanotechnology. (scitechdaily.com)
Traditional molecular chemistry involves the strong covalent bonds formed by the sharing or exchange of electrons between the atoms that make up a molecular system. (scitechdaily.com)
Supramolecular chemistry involves systems that are held together by a multitude of weaker, non-covalent connections, such as hydrogen bonds and electrostatic and Van der Waals forces. (scitechdaily.com)
In supramolecular chemistry, the dimers are connected by many weak non-covalent bonds. (labmanager.com)
Although supramolecular chemistry started out as an effort to create new molecular hosts that hold on to complementary molecular guests through non-covalent bonds, the field has recently branched out to explore non-covalent interactions between the guests in order to create new 'chemical species,'" Fatila said. (labmanager.com)
Chemists can synthesize PIMs through a process, known as nucleophilic substitution, which enables covalent bonds to simultaneously form between two aromatic ring compounds. (sciencedaily.com)
summarize tunable orthogonal reversible covalent bonds as a means of dynamic chemical control. (chemistryviews.org)
Lignin is a combinatorial polymer comprising monoaromatic units that are linked via covalent bonds. (jbei.org)
For example, the hydrogen bonds that connect water molecules to one another are non-covalent, breaking and reforming constantly to give rise to the fluid properties of water. (nanowerk.com)
Most self-healing polymers form hydrogen bonds or metal-ligand coordination, but these aren't suitable for ionic conductors," Wang says. (nanowerk.com)
We are currently tweaking the covalent bonds within the polymer itself to get these materials ready for real-world applications. (nanowerk.com)
A relatively small molecule that can form covalent bonds with other molecules of this type to form a polymer. (coursehero.com)
Carbohydrates, proteins, and nucleic acids are built from small molecular units that are connected to each other by strong covalent bonds. (coursehero.com)
During polymerization, individual polymer chains are formed by covalent bonds, which are crosslinked by secondary bonds. (bvsalud.org)
Factor XIIIa catalyzes the formation of covalent bonds between glutamine and lysine residues on the fibrin a and g chains, enhancing the mechanical strength of the fibrinpolymer. (medscape.com)
This means that we are using non-covalent interactions between molecules, mainly hydrogen bonds, to construct assemblies of molecules that should have new properties that are more than the sum of the individual molecules. (lu.se)
Because of the non-covalent nature of the bonds between bases, the DNA molecules "melt" (base pairs get separated) when heated above room temperature. (lu.se)

A triazine -based covalent organic porous polymer (COP) was synthesized from the monomers 1,3,5-triphenylbenzene and tricyanogen chloride via the Friedel-Crafts reaction and characterized in detail using Brunauer-Emmett-Teller analysis , X-ray photoelectron spectroscopy , elemental analysis , and scanning electron microscopy , which confirmed that the COP had a rough surface and suitable extraction site. (bvsalud.org)
A polymer is a chain of many monomers. (labmanager.com)
Ring-closing olefin metathesis has been shown to provide a very high yielding route to [c2]daisy-chains suitably functionalized to allow their one-step conversion to bis-olefins which can be used as monomers in ADMET polymerizations to afford mechanically interlocked polymers. (caltech.edu)
Most (but not all) biological macromolecules are polymers, which are any molecules constructed by linking together many smaller molecules, called monomers. (coursehero.com)
Typically all the monomers in a polymer tend to be the same, or at least very similar to each other, linked over and over again to build up the larger macromolecule. (coursehero.com)
These simple monomers can be linked in many different combinations to produce complex biological polymers, just as a few types of Lego blocks can build anything from a house to a car. (coursehero.com)
Examples of these monomers and polymers can be found in the sugar you might put in your coffee or tea. (coursehero.com)
Regular table sugar is the disaccharide sucrose (a polymer), which is composed of the monosaccharides fructose and glucose (which are monomers). (coursehero.com)
The small molecular units are called monomers (mono means one, or single), and they are linked together into long chains called polymers (poly means many, or multiple). (coursehero.com)
Lipids are not polymers, because they are not built from monomers (units with similar composition). (coursehero.com)
Thrombin converts fibrinogen into fibrin monomers, and the fibrin monomers polymerize into fibrin polymers that bind aggregated platelets into platelet-fibrin hemostatic plugs. (msdmanuals.com)
Dual-curing resin cements present two activation systems (chemical and light activation) for a thorough and uniform conversion of monomers into polymers, even when the composition, thickness and color of the ceramic restoration could hamper the transmission of the curing light used to polymerize the cement 1 . (bvsalud.org)
The degree of conversion of the material, which is the average number of monomers that form the polymer chains, is directly related to the length and crosslinking of the network and indirectly to water sorption. (bvsalud.org)
The polymer network of a resin-based material is composed by crosslinked molecules and unreacted monomers not linked to the chains. (bvsalud.org)
The diisocyanate monomers are important commercially the most important aromatic isocyanates, because the two NCO groups allow them to undergo direct whereas 1,6-HDI, isophorone diisocyanate (IPDI), methyle- polymerization reactions with alcohols to form polyur- nedicyclohexyl diisocyanate (HMDI), and their higher ethanes, in addition to enabling prepolymerization reactions polymers are the most important aliphatic isocyanates. (cdc.gov)

A protocol for the synthesis and characterization of diffusive motion of cyclic polymers at the single molecule level is presented. (jove.com)
The results demonstrate that the diffusional heterogeneity of polymers that is often hidden behind ensemble averaging can be revealed by the efficient synthesis of the cyclic polymers using the ESA-CF process and the quantitative analysis of the diffusive motion at the single molecule level using the MSD and CDF analyses. (jove.com)
In order to characterize molecular level dynamics of cyclic polymers, a synthesis method that provides high purity cyclic polymers and an experimental and analysis methods that allow for quantitative characterization of molecular motion at the single molecule level have to be developed. (jove.com)
The focus of this event will be the design and synthesis of a wide range of functional organic polymers including electroactive, chiral, porous, and bio-inspired polymeric materials. (chemistryviews.org)

Herein, we report a simple "helix-to-tube" strategy to construct robust, covalent ONTs from easily accessible poly( m -phenylene diethynylene)s (poly-PDEs) possessing chiral amide side chains that can adopt a helical conformation through hydrogen-bonding interactions. (nagoya-u.ac.jp)
That our framework is held together by reversible, non-covalent supramolecular interactions ensures good solubility in water," Li says. (scitechdaily.com)
Distribution and chemical interactions of OTS with wood polymers has been investigated by scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy. (degruyter.com)
In particular, the identification of dominant interactions of electrostatics and hydrophobicity was observed given the sensitivity of binding assays to salt disruption and the manipulation of block polymer copolymer architecture. (umass.edu)
Furthermore, limitations of current assays to quantify polymer-protein binding were discussed and a new method of Covalent- Labeling Mass Spectrometry was introduced to quantify non-covalent polymer interactions with model protein surface patches. (umass.edu)
This represents the first use of this method for identifying non-covalent polymer-protein interactions. (umass.edu)
This method allowed for increased understanding of the binding interactions between polymer-based CPPMs and anionic and hydrophobic surface patches on protein cargo. (umass.edu)
The role of polymer self-assembly was observed to impact not only initial binding interactions with protein cargo, but also internalization and intracellular activity. (umass.edu)
Ion-dipole interactions have never been used for designing a self-healing polymer, but it turns out that they're particularly suitable for ionic conductors," Wang says. (nanowerk.com)
The polymer chains are linked to each other by ion-dipole interactions between the polar groups in the polymer and the ionic salt. (nanowerk.com)
In our group we use advanced organic chemistry to covalently build up the molecules (building blocks) we want to assemble by non-covalent interactions after designing the molecules with respect to hydrogen-bonding pattern and their spatial positions to form the desired aggregate. (lu.se)

Besides polyimines, other types of dynamic covalent chemistry can also be used. (wikipedia.org)
Journal of Polymer Science Part A - Polymer Chemistry. (wikipedia.org)
In molecular chemistry, two monomer molecules connected by a strong covalent bond are called a "dimer. (labmanager.com)
Use of self-assembly and dynamic covalent chemistry to design and assemble host-guest systems and discrete macromolecular aggregates. (wesleyan.edu)

Cyclic polymer dynamics has been investigated using both synthetic and naturally occurring molecules by means of ensemble averaged experimental methods such as nuclear magnetic resonance (NMR), light scattering, and viscosity measurements. (jove.com)
10 Furthermore, spatiotemporal heterogeneities of the motion of individual molecules caused by inherent structural heterogeneity of entangled polymers are often hidden behind the ensemble averaging in these studies. (jove.com)
Wang's team at the University of California, Riverside, turned instead to a different type of non-covalent bond called an ion-dipole interaction, a force between charged ions and polar molecules. (nanowerk.com)

While it was found that the [2]catenane monomer could function as a ROMP monomer, no interlocked polymers were observed as products from the polymerization. (caltech.edu)
Many small monomer subunits combine to form this carbohydrate polymer. (coursehero.com)
Besides smoke sources, indoor sources include consumer product off-gassing of residual styrene monomer in polymer and copolymer materials. (who.int)

Triazine-based covalent porous organic polymer for the online in-tube solid-phase microextraction of polycyclic aromatic hydrocarbons prior to high-performance liquid chromatography-diode array detection. (bvsalud.org)

Previous self-healing polymers haven't worked well in high humidity, Wang says. (nanowerk.com)

We've demonstrated the first soluble single-layer 2D honeycomb SOF that combines the ordering and porous features of MOFs with the solubility of supramolecular polymers," says Yi Liu, a chemist with Berkeley Lab's Materials Sciences Division. (scitechdaily.com)

Imine Polyimide Polyamide Vitrimers Covalent adaptable network (CAN) Suematsu, K. (wikipedia.org)

Previous work in the Tew group has demonstrated polymer cell-penetrating peptide mimics (CPPMs) as effective transporters of biological agents, including proteins and antibodies. (umass.edu)
These synthetic polymers non-covalently bind to cargo, offering a mechanism to deliver proteins in a way that does not alter protein secondary structure. (umass.edu)
New assays to investigate competition of polymer-cargo complexes by intracellular proteins were introduced and revealed that competition of xii polymer-cargo is influenced by initial binding strength. (umass.edu)
Poly(ADP-ribosyl)ation is therefore an immediate, covalent, but transient post-translational modifications of nuclear proteins, induced by DNA lesions. (imim.es)
Natural biomolecules such as proteins are an attractive alternative to synthetic polymers which are commonly used in drug formulations because of their safety. (cdc.gov)

The obtained polymer network, Covalent Organic Polymer - COP-100 possesses strong fluorescent properties and designed solubility in polar aprotic solvents, which shows promise for use as a metal-sensing material in solution. (edu.sa)
Fluorine units can impart special characteristics to ladder polymers such as Teflon-like chemical resistance, improved solubility, and high thermal stability, notes Krishnan. (sciencedaily.com)

The diffusive motion of individual cyclic polymer chains in a melt state is visualized using single molecule fluorescence imaging by incorporating a fluorophore unit in the cyclic chains. (jove.com)
The cyclic polymer exhibits multiple-mode diffusion which is distinct from its linear counterpart. (jove.com)

Chain collapse in synthetic polymers is an excellent approach for mimicking the natural self-folding process that imparts structural control, leading to attractive compartmental applications, e.g. drug delivery. (ehesanali.com)
The study demonstrates the growing potential of polymer photocatalysts for oxygen evolution by structural engineering and post-synthetic metalation. (strath.ac.uk)
The structural diversity afforded by polymer-based synthetic CPPMs was additionally leveraged to design a series of polymers with previously optimized hydrophobic:cationic block ratios of 2:1. (umass.edu)

The helically folded poly-PDEs subsequently undergo light-induced cross-linking at longitudinally aligned 1,3-butadiyne moieties across the whole helix to form covalent tubes (ONTs) both in solution and solid phases. (nagoya-u.ac.jp)
The structures of poly-PDEs and covalent ONTs were characterized by spectroscopic analyses, diffraction analysis, and microscopic analyses. (nagoya-u.ac.jp)
Here, we will show a method to synthesize high-purity cyclic and dicyclic poly(THF)s that incorporate a fluorophore unit using an electrostatic self-assembly and covalent fixation (ESA-CF) process 11-13 and a method to analyze the motion of the individual fluorophore-incorporated polymer chains using a combination of mean-squared displacement (MSD) and cumulative distribution function (CDF) analyses. (jove.com)
Influence of Polymer Architecture and Molecular Weight of Poly(2-(dimethylamino)ethyl methacrylate) Polycations on Transfection Efficiency and Cell Viability in Gene Delivery. (mpg.de)
Poly(lactic-co-glycolic) acid (PLGA) is the typical polymer approved by US FDA, which offers several advantages in the design of SDDSs. (nature.com)
ADP-ribose polymers are then subjected to degradation by poly-ADP-ribose-glycohydrolase. (imim.es)
The key design idea in the development of the material was to use a polar, stretchable polymer, poly(vinylidene fluoride-co-hexafluoropropylene), plus a mobile, ionic salt. (nanowerk.com)

Covalent gated supramolecular star polymers in aqueous solution. (mpg.de)

With an adequate MSD and CDF analyses, a multiple-mode diffusion of the cyclic and dicyclic polymers in the melt and semi-dilute solution of the linear polymer chains has been revealed, 14-16 suggesting the significant effects of the topological states of the polymers on the diffusive motion of the chains under entangled conditions. (jove.com)

Here, we present a bipyridine based covalent triazine-based framework containing metal coordination sites (Bpy-CTF). (strath.ac.uk)

Cyclic polymers are unique in that they do not have chain ends. (jove.com)
An azide terminated polymer was prepared using ROMP in the presence of chain transfer agents (CTA). (caltech.edu)
Polymers tend to pack tightly together in the solid state, easily filling any voids with their flexible chain structure. (sciencedaily.com)

Herein, we developed a trialkylsilyl substituted 2D-conjugated polymer with the highest occupied molecular orbital level down-shifted by Si-C bond interaction. (nature.com)

Further, sequential folding of the polymers is demonstrated by the addition of the host molecule followed by exposure to UV B irradiation. (ehesanali.com)

A method for the production of cyclic polyammonium ions is presented which utilizes a polymer cyclization of azide terminated linear polymer based on the "click" reaction. (caltech.edu)

Typical applications of nanoindentation for characterization of viscoelastic, creep and temperature dependent properties of polymers. (covalentmetrology.com)
This application report presents several applications of nanoindentation for characterization of polymers. (covalentmetrology.com)
The main part is dedicated to characterization of viscoelastic properties of polymers but the nanoindentation stress-strain technique as well as indentation at elevated temperatures are mentioned. (covalentmetrology.com)
Characterization and quantification of polymer-protein binding relationships were established using fluorescence quenching assays. (umass.edu)

Factor XIII is a plasma transglutaminase that catalyzes the final step in the coagulation cascade, cross-linking the loose fibrin polymer into a highly organized structure. (medscape.com)

The reversibility of the covalent units in the polymers have made it possible to develop several kinds of functionalities, including formations of objective polymers repeatedly, structure controls of polymers by environmental changes, and recyclable polymers. (elsevierpure.com)

Polyimines are classified as polymer materials that contain imine groups, which are characterised by a double bond between a carbon and nitrogen atom. (wikipedia.org)

However, the self-assembly of well-defined 2D supramolecular systems polymers in solution has been a challenge because such polymers tend to precipitate out of solution, making them difficult to manipulate and characterize. (scitechdaily.com)

Particularly polymers including linear polymers, polymers with designed architectures, and cross-linked polymers, which cannot be obtained by general polymerization techniques, are introduced in this review. (elsevierpure.com)
A new carbon-carbon bonded nanoporous polymer network was synthesized via efficient and catalyst free Knoevenagel-like condensation polymerization in near quantitative yields. (edu.sa)
However, the immediate light-activation of a dual-cured resincement, as recommended by the manufacturer, may have a deleterious effect on polymerization if it stiffens the polymer, limiting the process of chemical activation. (bvsalud.org)

In this regard, water-soluble and thermo-responsive polyacrylamide polymers CP1-2 with photodimerizable coumarin moieties grafted into the backbone are employed to design polymeric nanoparticles. (ehesanali.com)
AS a supplier of a large selection of monodisperse polymer nanoparticles and microspheres with multiple sizes from 20 nm to 100 µm, CD Bioparticles can offer monodisperse polymer microspheres based on melamine resin. (selfgrowth.com)
Moreover, due to their defined primary structure, protein-based nanoparticles offer various possibilities for surface modifications including covalent attachment of drugs and targeting ligands. (cdc.gov)

The results indicate that the alkylsilyl substitution is an effective way in designing high performance conjugated polymer photovoltaic materials. (nature.com)
These materials represent more sustainable and less harmful alternatives to previously used halogenated polymers. (wikipedia.org)
Apart from polyimine polymers that are formed directly via the condensation reaction from aldehydes and amines, it is also possible to incorporate imines in other existing polymer materials. (wikipedia.org)
Functional Materials from Self-Assembling Peptide-Polymer Hybrids. (mpg.de)
Hybrid Supramolecular-Covalent Polymers as Neural Scaffold Materials. (mpg.de)
In this chapter, we will review some of the current and most promising strategies that have been used over the years to develop polymeric materials with improved hemocompatibility, including highly hydrophilic or hydrophobic surfaces, albumin coated surfaces, zwitterionic polymers, attached endothelial cells, patterned surfaces, immobilized heparin, and nitric oxide (NO) releasing/generating surfaces. (springer.com)

Recently, however, polymers of intrinsic microporosity (PIMs) have emerged that use rigid, fused organic ring structures to open up tiny voids in the plastic material. (sciencedaily.com)

Such multi-stimuli-responsive compaction of size with synergistic control of non-covalent and dynamic covalent interaction and tuning of LCST render the system suitable for compartmental loading and sustainable/burst release of hydrophilic and hydrophobic cargos e.g. rhodamine B dye and the drug ibuprofen under homeostasis control. (ehesanali.com)

The ability to assemble PIMs piece-by-piece gave the researchers broad control over their structure: they produced several kinds of linear and ladder polymers by controlling the degree of nucleophilic substitution. (sciencedaily.com)

Melamine (1, 3, 5-triamino-2, 4, 6-triazine) resin , or melamine formaldehyde (MF) is one of the hardest and stiffest thermosetting polymers, which provides good properties and performance. (selfgrowth.com)
With excellent physical and chemical properties, CD Bioparticles' melamine resin particles offer many advantages over other conventional polymer particles, such as high temperature resistance up to 300 °C, extremely high resistance in all organic solvents and superior mechanical stability. (selfgrowth.com)
The fascinating properties of organic polymers and their processing towards energy, electronics, biomedical, or environmental applications will be discussed as well. (chemistryviews.org)
These polymers were further investigated for their self-assembly properties. (umass.edu)
For the next step, the researchers are working on altering the polymer to improve the material's properties. (nanowerk.com)

In the non-fullerene PSCs, medium bandgap polymer donor-low bandgap n-OS acceptor pairs are particular interesting due to their complementary absorption in the visible-near infrared region, providing an effective approch for getting a high J sc . (nature.com)

These covalent transthyretin kinetic stabilizers exhibit superior amyloid inhibition potency compared to their noncovalent counterparts, and they prevent cytotoxicity associated with amyloidogenesis. (rcsb.org)

Here, mechanophotopatterning (MPP) on a covalent adaptable elastomeric network is introduced and enables for the first time the ability to precisely and simultaneously manipulate both material shape and surface topography by exposure to light without the need for solvents, molding, or physical contact. (aiche.org)
This material responds to MPP by continuously and locally deforming via polymer network connectivity rearrangement, which enables 3D control of its geometry. (aiche.org)

Covalent Metrology is a disruptive analytical services laboratory and platform based in Sunnyvale, California. (covalentmetrology.com)

Membrane prototypes based on ladder polymers are the next focus of Krishnan and Parthiban as they strive to improve real world gas separations. (sciencedaily.com)

Krishnan and Parthiban reacted OFCP with rigid benzene-type rings to synthesize fluorinated ladder polymers. (sciencedaily.com)

Anatomy2

Chemicals and Drugs75

Analytical, Diagnostic and Therapeutic Techniques and Equipment30

Phenomena and Processes22

Disciplines and Occupations7

Technology, Industry, Agriculture44

Information Science1

Health Care3

Frameworks6

Bonds21

Monomers15

Synthesis4

Interactions11

Chemistry4

Molecules3

Monomer3

Porous organic1

Self-healing1

Supramolecular polymers1

Adaptable network1

Proteins5

Solubility2

Cyclic polymer2

Synthetic3

Poly7

Aqueous solution1

Chains1

Framework1

Chain3

Molecular1

Molecule1

Linear polymer1

Characterization4

Fibrin1

Recyclable1

Bond1

Tend1

Polymerization3

Nanoparticles3

Materials6

Intrinsic1

Dynamic1

Assemble1

Properties5

Donor1

Inhibition1

Enables2

Laboratory1

Membrane1

Synthesize1