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Showing 1 to 20 of 41 for “"graft copolymers"”.
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Regioselective Design of Polysaccharide Ester Graft Copolymers
Polysaccharide graft (co)polymers, where a polysaccharide comprises the backbone and a separate (co)polymer comprises grafted side chains, are growing in popularity as blend compatibilizers, sustainable elastomers, self-assembling materials, and drug delivery components. This popularity is …
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Block and Graft Copolymers Containing Carboxylate or Phosphonate Anions
… focuses on synthesis and characterization of graft and block copolymers containing carboxylate or phosphonate anions that are potential candidates for biomedical applications such as drug delivery and dental adhesives. Ammonium bisdiethylphosphonate (meth)acrylate and acrylamide phosphonate …
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Synthesis and characterization of poly(2,2,2- trifluoroethoxyphosphazene)polystyrene graft copolymers
… is(2,2,2-trifluoroethoxyphosphazene)]-polystyrene graft copolymers were synthesized by a “grafting onto" reaction which involved a reaction between two preformed, reactive polymer chains. In this case, poly(dichlorophosphazene) was the reactive polymer backbone onto which approximately 10 weight …
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TEM/EDXS studies of phase separation in block and graft copolymers
… microdomain formation of a variety of block- and graft-copolymers were studied by Transmission Electron Microscopy (TEM). Molecular variables included chemical composition: dimethyl-, fluoropropyl and diphenyl-siloxane , sulfone styrene, paramethylstyrene, t-butylstyrene, arylester and methyl …
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Well defined graft copolymers and end functional materials: synthesis, characterization and adhesion studies
… of well defined end functional materials and graft copolymers. Group transfer polymerization was utilized to synthesize acrylic terminal poly(methyl methacrylate) (PMMA) macromonomers of controlled molecular weight and narrow molecular weight distribution. A systematic series of PMMA …
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Thermo-responsive Graft Copolymers based on Poly(Methyl Vinyl Ether): from Synthesis to Evaluation
… the limits in the design of novel types of graft copolymers with potential applications such as drug carriers, switchable amphiphiles, mineralization templates, etc... Several synthetic concepts have been designed to graft this polymer onto hydrophilic and hydrophobic polymer backbones. For …
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Tailoring Reactivity, Architecture and Properties of High Performance Polyimides: From Additive Manufacturing to Graft Copolymers
… facilitated synthesis of PEIs and PI graft copolymers. When coupled with 4,4'-(4,4'-isopropylidene-diphenoxy)diphthalic anhydride (BPADA) and meta-phenylene diamine (mPD), the PEG-grafted materials exhibited signs of phase mixing at low mol% incorporation of macromonomer, with a single …
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Synthesis of novel siloxane-containing block and graft copolymers by anionic polymerization and the macromonomer technique
The synthesis of novel well defined graft copolymers is now possible with the recent advent of the macromonomer technique. Copolymers with narrow molecular weight distributions of the backbone as well as the grafts are possible. The anionic alkyl- lithium initiated ring opening polymerization of …
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Morphological effects on gas transport through poly(methylmethacrylate)-poly(dimethlysiloxane) graft copolymers and instrumentation for their synthesis and permeability characterization
… of especially well-defined or "model" block and graft copolymers have received increasing interest among academic and industrial communities. The well-defined nature of such polymers makes them ideal subjects for both fundamental studies and specialty polymer applications. This study addresses …
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Synthesis and characterization of high Tg nanofoams based on pyromellitic dianhydride and 1,1-bis(4-aminophenyl)-1-phenyl-2,2,2-trifluoroethane polyimide block and graft copolymers
Thermally stable polyimide block and graft copolymers with labile con1ponents (especially polypropylene oxide), have been prepared and investigated as low dielectric materials that afford desirable thermal, mechanical and electrical properties. Polyimide nanofoams based upon the controlled …
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Functionalized Polyisobutylene: From Synthesis to Properties and Applications
… modification of the double bonds of IIR and the grafting of poly(ethylene oxide) (PEO) chains along the polymer backbone, a library of linear PIB-PEO graft copolymers (lin-PIB-g-PEO) was successfully generated containing up to 83 wt% PEO content. The properties of the resulting graft copolymers …
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Synthesis and Characterization of Multiphase Block Copolymers: Influence of Functional Groups on Macromolecular Architecture
… of the SBRs. Novel site-specific sulfonated graft copolymers, poly(methyl methacrylate)-g-(poly(sulfonic acid styrene)-b-poly(tert-butyl styrene)), poly(methyl methacrylate)-g-(poly(tert-butyl styrene)-b-poly(sulfonic acid styrene)), and the corresponding sodium sulfonate salts were …
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New polymeric biomaterial interfaces for biosensor applications
… poly(allylamine)-g- poly(ethylene glycol) graft-copolymer and poly(ethylene glycol) dimethacrylate hydrogel. Poly(allylamine)-g-poly(ethylene glycol) polycation graft-copolymers were designed, synthesized, and characterized in order to combine bio-functionality with patternability on …
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Synthesis, characterization and kinetic investigations of heterophase materials prepared using group transfer polymerization
… by the preparation of well defined block and graft copolymers. Hence, there has been a growing emphasis on new synthetic methods for the preparation of blocks and grafts. Group Transfer Polymerization (GTP) is a relatively new synthetic method which provides a means to obtain poly(alkyl …
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Studies of the Evaluation of Solid Phase Dispersants in Polymer Blends
… these blends. To improve performance, block and graft copolymers of ethylene-styrene as solid phase dispersants (SPDs) were added to blends containing equal proportions of LDPE and PS. Since this composition represents the poorest balance of properties in this system, it has been found that the …
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Ionic Copolymer-Magnetite Complexes for Magnetic Resonance Imaging and Drug Delivery
… included phosphonate and carboxylate-containing graft and block copolymers. Oleic-acid coated magnetite nanoparticles (8-nm and 16-nm diameters) were investigated. Cisplatin and carboplatin were used as sample drugs. The potentials of the magnetite-ionomer complexes as dual drug delivery carriers …
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Novel polymer architectures: polyrotaxanes
… considered to be physical analogs of block or graft copolymers or molecular interpenetrating systems. The design and synthesis of the macrocyclic component, "blocking groups" to constrain the macrocycles and the polyrotaxane will be described.
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Presentation and accessibility of surface bound ligands on amphiphilic graft copolymer films
Amphiphilic comb-type graft copolymers comprising a poly(methyl methacrylate) (PMMA) backbone and short, polyethylene oxide (PEO) side chains, PMMA-g-PEO, are proposed to self-organize at the polymer/water interface, resulting in quasi-2D confinement of the backbone at the immediate surface. The …
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Composite cathodes for lithium rechargeable batteries
… within preferred domains of self-organizing copolymers was investigated towards the fabrication of composite, nanoarchitectured electrode materials for solid-state rechargeable batteries. In situ growth of cathodic phases within ion-conducting copolymer domains was explored as a means to …
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Synthesis and characterization of heterocyclic polymers: polybenzoxazoles and cyanate ester networks
… of multiphase microphase separated block and graft copolymers. The second component investigated was based upon the thermally labile structure derived from polypropylene oxide (PPO). Block copolymers were prepared from either hydroxyl or aminophenyl terminated polypropylene oxide. The …
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