Diblock copolymersMembranesPolySelective solventMorphologyAmphiphilic diblockRing-opening polymeGelsNanoparticlesSynthesis of blockBlockPolymer chemistryMacromoleculesRAFTRheologySituConsistMolecularDegradationSyntheticDescribed hereinRatioYieldPropertiesStableFilmsFormSurfaceOrderTypeLayersChainDrug deliverySize
Diblock copolymers4
- Diblock copolymers are made using living polymerization techniques, such as atom transfer free radical polymerization (ATRP), reversible addition fragmentation chain transfer (RAFT), ring-opening metathesis polymerization (ROMP), and living cationic or living anionic polymerizations. (wikipedia.org)
- Enomoto Y, Kamitakahara H, Takano T, Nakatsubo F (2006) Synthesis of diblock copolymers with cellulose derivatives. (springer.com)
- Enomoto-Rogers Y, Kamitakahara H, Yoshinaga A, Takano T (2011) Synthesis of diblock copolymers with cellulose derivatives 4. (springer.com)
- Dynamics of amphiphilic diblock copolymers at the air-water interface. (mpg.de)
Membranes3
- Under a 4 V direct current (DC) applied voltage, electromechanical transducers derived from these triblock copolymer membranes with added ionic liquid showed superior actuation performance compared to a benchmark Nafion® membrane, suggesting potential for ionic polymer device applications. (elsevierpure.com)
- We develop a multiscale simulation model for diffusion of solutes through porous triblock copolymer membranes. (aip.org)
- The present work deals with the preparation of ultrafiltration (UF) and microfiltration (MF) membranes with enhanced fouling resistant ability by using two different methods, liquid- induced phase separation (LIPS) and vapor-induced phase separation (VIPS), after in-situ modification of the PVDF solution using amphiphilic PS-b-PEGMA block copolymers as additive. (ncl.edu.tw)
Poly12
- This study presents the effect of graphene (or few-layer graphene) on the self-assembly and the mechanical properties of a thermoreversible gel consists of a physically cross-linked poly (methyl methacrylate)-poly (n-butyl acrylate)-poly (methyl methacrylate) [PMMA-PnBA-PMMA] triblock copolymer in 2-ethyl-1-hexanol, a midblock selective solvent. (aiche.org)
- Micelle and Gel Formation in a Poly (ethylene oxide)/ Poly (propylene oxide)/ Poly (ethylene oxide) Triblock Copolymer in Water Solution. (dtu.dk)
- Novel poly(lactic acid)-based chain extended triblock copolymers have been successfully synthesized in melt. (researcher-app.com)
- The new polymers are characterized by a triblock ABA architecture, where A, is poly(lactic acid) and B is an ad hoc synthesized random biobased aliphatic copolyester poly(propylene/neopentyl glycol succinate). (researcher-app.com)
- Here we employ X-ray photon correlation spectroscopy (XPCS) to explore the temperature-dependent dynamics, relaxation time, and microrheology of multicomponent hydrogels comprising of commercial poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) triblock copolymer F127 and alginate. (nsf.gov)
- The designed triblock copolymers composed of quaternized poly(phenylene oxide) segments and poly(ether sulfone) segments are responsible for the microphase separated morphology and well-connected ion domains, as confirmed by transmission electron microscopy. (researcher-app.com)
- Crystallization of glassy-crystalline-glassy poly(vinylcyclohexane)-b- polyethylene-b-poly(vinylcyclohexane) (PVCH-PE-PVCH) triblock copolymer treated in supercritical Carbon Dioxide (scCO 2 ) was investigated by using differential scanning calorimetry (DSC) and atomic force microscope (AFM). (umn.edu)
- We report a one-pot synthesis of ABC triblock copolymers of poly(ethylene glycol)- (PEG-) polystyrene- (PS-) poly(methyl methacrylate) (PMMA), and poly(epsilon-caprolactone)- (PCL-) PS-PMMA by combining in situ click [3 + 2] and Diels-Alder [4 + 2] reactions. (itu.edu.tr)
- Amphiphilic block copolymers comprised of poly(lactic acid- co -glycolic acid) and poly(ethylene glycol) are thermogelling materials with biodegradable segments. (sigmaaldrich.com)
- The thermogelation properties of poly(lactic acid- co -glycolic acid)- block -poly(ethylene glycol)- block -poly(lactic acid- co -glycolic acid) (PLGA- block -PEG- block -PLGA) copolymers designed for controlled delivery systems will be described. (sigmaaldrich.com)
- Chen D (2013) Crystal behavior of semicrystalline polystyrene-block-poly(L-lactide) diblock copolymer in thin films with various structures. (springer.com)
- Fluorescent pyrene probe method was employed to measure critical micelle concentration (CMC) of oligocarbonate-fluorene end-functionalized poly(ethylene glycol) (FmE445Fm) triblock copolymers in water. (nist.gov)
Selective solvent2
- Such particles are formed in a colloidal solution of amphiphilic macromolecules of narrowly dispersed block copolymers in a selective solvent that selectively dissolves one of the blocks. (springer.com)
- In particular, in dispersion RAFT polymerization it is often difficult to choose a selective solvent in which all reagents are readily soluble but which is selective with respect to the blocks of the synthesized block copolymer. (springer.com)
Morphology6
- Dynamic mechanical analysis (DMA) of the A-BC-A triblock copolymers exhibited a plateau region, which suggested the formation of a microphase-separated morphology. (elsevierpure.com)
- Atomic force microscopy (AFM) and small angle X-ray scattering (SAXS) collectively probed the morphology of the A-BC-A triblock copolymers, revealing long-range order at the nanoscale dimensions. (elsevierpure.com)
- The role of morphology was demonstrated with block copolymer nanoscale structures providing superior ionic conductivity and mechanical performance compared to random copolymers. (elsevierpure.com)
- This was attributed to optimum modulus, improved ionic conductivity, and microphase-separated morphology of triblock copolymers. (elsevierpure.com)
- As the triblock layer thickness is decreased and the draw ratio is increased, the triblock morphology is constrained into a preferential orientation and higher long-range order is observed by transmission electron microscopy and small angle X-ray scattering. (ensam.eu)
- At present, one of the simplest and most affordable methods for preparing such a colloidal solution is heterophase-controlled polymerization occurring by the reversible addition−fragmentation chain transfer ( RAFT ) mechanism, which makes it possible to simultaneously control the molecular characteristics of the synthesized block copolymer and tune the size and morphology of the resulting micelles in the nanoscale. (springer.com)
Amphiphilic diblock1
- We investigate the aggregation number and size distributions for inter-molecular clusters of amphiphilic diblock and triblock copolymers in poor solvent at very low concentrations. (edpsciences.org)
Ring-opening polyme1
- The PCEC copolymers, synthesized via ring-opening polymerization of epsilon-caprolactone, were characterized by H-1 NMR, quantitative C-13 NMR, GPC, DSC and WAXS. (ac.rs)
Gels1
- PLGA-PEG-PLGA copolymers in neat state are semi-viscous gels (Product No. 764817 and 764787). (sigmaaldrich.com)
Nanoparticles2
- This study is about the surface modification of hydrophilic silica nanoparticles by non-chemical adsorption of an amphiphilic triblock copolymer (Pluronic F-127) and its influence on surface tension and interfacial rheology. (nanopaint-itn.eu)
- Enzyme cleavable nanoparticles from peptide based triblock copolymers. (mpg.de)
Synthesis of block1
- Ceresa RJ (1961) The synthesis of block and graft copolymer of cellulose and its derivatives. (springer.com)
Block24
- Hydrolytic, enzymatic degradation and composting under controlled conditions of series of triblock PCL/PEO copolymers, PCEC, with central short PEO block (M (n) 400 g/mol) are presented and compared with homopolymer (PCL). (ac.rs)
- Furthermore, composting of polymer films in a model compost system at 37 A degrees C resulted in significant degradation of the all synthesized block copolymers. (ac.rs)
- Linear copolymers consist of a single main chain and include alternating copolymers, statistical copolymers, and block copolymers. (wikipedia.org)
- A possible sequence of repeat units A and B in a triblock copolymer might be ~A-A-A-A-A-A-A-B-B-B-B-B-B-B-A-A-A-A-A~. Block copolymers are made up of blocks of different polymerized monomers. (wikipedia.org)
- Here, we show how soft self-assembling materials-block copolymer thin films-can be manipulated to form a diverse library of previously unreported morphologies. (nature.com)
- Specifically, block copolymer films are immobilized on surfaces, and template successive layers through subtle surface topography. (nature.com)
- This strategy generates an enormous variety of three-dimensional morphologies that are absent in the native block copolymer phase diagram. (nature.com)
- With increasing the T, the T m of the samples linearly increased, even up to 108°C, close to the T m (∼ 110°C) of the PE homopolymer hydrogenated from polybutadiene which is equal to the PE block in the triblock copolymer. (umn.edu)
- Amphiphilic block copolymers are one class of polymers which display thermogelation behavior. (sigmaaldrich.com)
- Factors that control thermogelation in amphiphilic block copolymers include molecular weight of block segments, chemical composition of blocks, polymer concentration in solution and end group functionality. (sigmaaldrich.com)
- The degradation rate of the copolymers can be tailored by the molecular weight of the degradable block segment and the ratio of lactide to glycolide. (sigmaaldrich.com)
- Triblock copolymers comprised of PLGA- block -PEG- block -PLGA with relatively low molecular weight were selected for this study. (sigmaaldrich.com)
- Amphiphilic conjugated block copolymers as NIR-bioimaging probes. (mpg.de)
- Exploring Disordered Morphologies of Blends and Block Copolymers for Light-Emitting Diodes with Mesoscopic Simulations. (mpg.de)
- Caillol S, Lecommandoux S, Mingotaud A-F, Schappacher M, Soum A, Bryson N, Meyrueix R (2003) Synthesis and self-assembly properties of peptide-polylactide block copolymers. (springer.com)
- Block-copolymers with cellulose propionate. (springer.com)
- Amphiphilic block copolymers at the liquid-fluid interface, investigated by evanescent light scattering and ellipsometry. (mpg.de)
- The triblock copolymers consist of an A-B-A architecture where the B block is the conjugat. (warf.org)
- UW-Madison and University of Chicago researchers have developed a method for directed self-assembly of block copolymer films that relies on obtaining the correct balance of surface energies for the te. (warf.org)
- The homophase polymerization of AA in the three-component system at 70°C, in which the mixed solvent with respect to PBATC is similar in thermodynamic quality to the θ-solvent at 22°, yields solutions of the narrowly dispersed block copolymer butyl acrylate-acrylic acid. (springer.com)
- The content of the block copolymer in solutions is 15-23%, the MW of the copolymer is 10-20 × 10 3 , and the polydispersity coefficient is 1.12-1.16. (springer.com)
- Synthetic amphiphilic block copolymers with surface activity are widely used as components of a wide variety of chemical products from motor oils and drilling fluids in oil production to household cleaning products and cosmetics [ 1 ]. (springer.com)
- Associates of amphiphilic block copolymers are of great practical interest. (springer.com)
- The problem can be solved by obtaining a colloidal solution of a block copolymer in a medium in which a homophase solution is formed at elevated temperatures of polymerization. (springer.com)
Polymer chemistry1
- In polymer chemistry, a copolymer is a polymer derived from more than one species of monomer. (wikipedia.org)
Macromolecules1
- When such a solution is cooled, the solvent becomes selective with respect to the blocks of the copolymer, inducing the self-organization of its macromolecules into nanoobjects. (springer.com)
RAFT2
- Reversible addition-fragmentation chain transfer (RAFT) polymerization enabled the synthesis of well-defined A-BC-A triblock copolymers containing a synergy of pendant ether and imidazolium sites. (elsevierpure.com)
- Direct synthesis of light-emitting triblock copolymers from RAFT polymerization. (mpg.de)
Rheology1
- Interfacial rheology and conformations of triblock copolymers adsorbed onto the water-oil interface. (mpg.de)
Situ1
- 1 Therefore, when applied in biomedical applications, the temperature responsive nature of the copolymer can be tuned to induce an in situ gelation at physiological temperature to provide controlled drug release. (sigmaaldrich.com)
Consist1
- Branched copolymers consist of a single main chain with one or more polymeric side chains, and can be grafted, star shaped, or have other architectures. (wikipedia.org)
Molecular3
- Copolymer with the highest content of PEO segment and the lowest molecular weight showed better degradation ability compared to PCL and other copolymers. (ac.rs)
- Copolymers can be characterized by a variety of techniques such as NMR spectroscopy and size-exclusion chromatography to determine the molecular size, weight, properties, and composition of the material. (wikipedia.org)
- In this study, we used zwitterionic copolymers comprising 2-methacryloyloxyethyl phosphorylcholine (MPC) units and n-butyl methacrylate (BMA) units with various molecular architectures for surface modification. (bvsalud.org)
Degradation1
- Copolymers with the higher lactide contents (Product No. 764817 ) decrease the rate of degradation as the additional methyl unit of lactide renders it is more resistant to hydrolysis than copolymers with 1:1 LA:GA molar ratio (Product No. 764787 ). (sigmaaldrich.com)
Synthetic1
- Many or even most synthetic polymers are in fact copolymers, containing about 1-20% of a minority monomer. (wikipedia.org)
Described herein1
- For the polymers described herein this means that (counter-intuitively) the copolymer dissolve more rapidly in cold water (or saline solution) (4-10 °C). Do not heat to dissolve. (sigmaaldrich.com)
Ratio1
- The reactivity ratio of a growing copolymer chain terminating in a given monomer is the ratio of the reaction rate constant for addition of the same monomer and the rate constant for addition of the other monomer. (wikipedia.org)
Yield1
- The best method to transfer to a new container is to dissolve in the original packaging (e.g. adding 5 mL of saline to ~1 g triblock would yield a 20 % solution) and then transfer the solution of known concentration. (sigmaaldrich.com)
Properties1
- Dielectric relaxation spectroscopy (DRS) examined the ion-transport properties of ionomeric A-BC-A triblock copolymers and random copolymers with different compositions. (elsevierpure.com)
Stable2
- To explore highly conductive and alkaline stable anion exchange membrane (AEM) materials, triblock copolymers bearing alkyl-tethered cycloaliphatic quaternary ammonium-head-groups are prepared via nucleophilic substitution, Friedel-Crafts acylation, ketone reduction and Menshutkin reaction. (researcher-app.com)
- The copolymer and triblock polymer are able to form stable siRNA-containing NPs without and with the addition of 5-nPBA-PEGm. (caltech.edu)
Films1
- Effects of pH and Additives on Aqueous Wetting Films Stabilized by a Triblock Copolymer (str. (srce.hr)
Form1
- First, a copolymer is prepared with alternating cMAP-PEG units that can form loops of PEG on the surface of the formulated siRNA-containing NPs. (caltech.edu)
Surface1
- Second, an mPEG-cMAP-PEGm triblock polymer is synthesized that could lead to a PEG brush configuration on the surface of the formulated siRNA-containing NPs. (caltech.edu)
Order1
- For this purpose, furan-protected maleimide end-functionalized PMMA, PS with alpha-anthracene and omega-azide end-functionality, and PEG or PCL with an alkyne end-functional group were reacted in N,N-dimehtylformamide (DMF) for 36 h at 120 degrees C in order to give the corresponding triblock copolymers. (itu.edu.tr)
Type1
- One-pot synthesis of ABC type triblock c. (itu.edu.tr)
Layers1
- The triblock copolymer layers thicknesses was varied from few hundreds to few tens of nanometers. (ensam.eu)
Chain2
- Commercial copolymers include acrylonitrile butadiene styrene (ABS), styrene/butadiene co-polymer (SBR), nitrile rubber, styrene-acrylonitrile, styrene-isoprene-styrene (SIS) and ethylene-vinyl acetate, all of which are formed by chain-growth polymerization. (wikipedia.org)
- Since a copolymer consists of at least two types of constituent units (also structural units), copolymers can be classified based on how these units are arranged along the chain. (wikipedia.org)
Drug delivery1
- Copolymers can be used to develop commercial goods or drug delivery vehicles. (wikipedia.org)
Size1
- Five formulations, (i) cMAP with 5-nPBA-PEGm, (ii) cMAP-PEG copolymer both (a) with and (b) without 5-nPBA-PEGm, and (iii) mPEG-cMAP-PEGm triblock polymer both (a) with and (b) without 5-nPBA-PEGm, are used to produce NPs in the 30-40 nm size range, and their circulation times are evaluated in mice using tail vein injections. (caltech.edu)