• 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)
  • 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)
  • 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)
  • 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)
  • 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)
  • 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)
  • 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)
  • PLGA-PEG-PLGA copolymers in neat state are semi-viscous gels (Product No. 764817 and 764787). (sigmaaldrich.com)
  • 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)
  • Ceresa RJ (1961) The synthesis of block and graft copolymer of cellulose and its derivatives. (springer.com)
  • 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)
  • In polymer chemistry, a copolymer is a polymer derived from more than one species of monomer. (wikipedia.org)
  • 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)
  • 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)
  • Interfacial rheology and conformations of triblock copolymers adsorbed onto the water-oil interface. (mpg.de)
  • 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)
  • 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)
  • 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)
  • 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)
  • Many or even most synthetic polymers are in fact copolymers, containing about 1-20% of a minority monomer. (wikipedia.org)
  • 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)
  • 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)
  • 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)
  • Dielectric relaxation spectroscopy (DRS) examined the ion-transport properties of ionomeric A-BC-A triblock copolymers and random copolymers with different compositions. (elsevierpure.com)
  • 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)
  • Effects of pH and Additives on Aqueous Wetting Films Stabilized by a Triblock Copolymer (str. (srce.hr)
  • 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)
  • 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)
  • 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)
  • One-pot synthesis of ABC type triblock c. (itu.edu.tr)
  • The triblock copolymer layers thicknesses was varied from few hundreds to few tens of nanometers. (ensam.eu)
  • 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)
  • Copolymers can be used to develop commercial goods or drug delivery vehicles. (wikipedia.org)
  • 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)