نتایج جستجو برای: graft copolymers

تعداد نتایج: 92068  

2015
Amandine Noel Yannick P. Borguet Karen L. Wooley

A series of hydrolytically degradable fluorescent poly(ferulic acid-co-tyrosine)-g-mPEG graft copolymers were synthesized and shown to undergo self-assembly in aqueous media to yield fluorescent micelles. The polymers and their micellar assemblies exhibited greater fluorescence emission intensity than did their small molecular building blocks, which provides a self-reporting character that has ...

Journal: :Journal of colloid and interface science 2005
Yan Zhang Yeng Ming Lam

Pluronic poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) (PEO-PPO-PEO) block copolymers are grafted with poly(vinyl pyrrolidone) by free radical polymerization of vinyl pyrrolidone with simultaneous chain transfer to the Pluronic in dioxane. This modified polymer has both thermal responsiveness and remarkable capacity to interact with a wide variety of hydrophilic and hydrop...

Journal: :Macromolecular rapid communications 2012
Sébastien-Jun Mougnier Cyril Brochon Eric Cloutet Guillaume Fleury Henri Cramail Georges Hadziioannou

The post-functionalization of poly(3-hexylthiophene) (P3HT) via various synthetic routes is reported. Well-defined and monofunctionalized ω-thiol-terminated P3HT, ω-carboxylic acid-terminated P3HT, ω-acrylate-terminated P3HT, and ω-methacrylate-terminated P3HT are obtained in high yields through a straightforward procedure. From those, different novel P3HT-based graft copolymers are synthesized...

2010
Ren-Shen Lee Yi-Ting Huang

The self-organization of amphiphilic block copolymers in water strongly depends on their molecular structure, particularly their hydrophilic–hydrophobic balance. This study proposes tuning the amphiphilicity of block copolymers by a click strategy. This work prepares novel amphiphilic block-graft PCL-b-(PaN3CL-g-PBA) copolymers that comprise poly(e-caprolactone) (PCL) as the hydrophobic segment...

2007
A. D. JENKINS

This paper presents a review of the methods available for preparing block and graft copolymers in which one component is acrylonitrile. Methods using polymer ions and polymer radicals are considered together with a useful new technique based on reactions of nitrile groups with amide compounds of group IV transition metals. Because of its polarity and its unusual solubility properties, a polyacr...

Journal: :Pure and Applied Chemistry 1976

2009
Kulandaivelu Sivanandan Tirtha Chatterjee Neil Treat Edward J. Kramer Craig J. Hawker

A strategy for the fabrication of high surface area poly(3-hexylthiophene) thin films by removal of nanoscale domains formed from graft copolymers is presented. This approach relies on the synthesis and characterization of cleavable graft copolymers based on regioregular poly(3-hexylthiophene) (rr-P3HT) main chain and sacrificial poly(styrene) side chains. An alkoxyamine initiator based on 2,2,...

Journal: :Chemical communications 2012
Xusong Pan Chao Chen Jiang Peng Yongan Yang Yinghan Wang Wen Feng Pengchi Deng Lihua Yuan

By exploiting hetero-complementary aromatic oligoamide units containing hextuple hydrogen bonds, supramolecular graft copolymers were successfully constructed in moderately polar media.

2002
Janne Virtanen Françoise Winnik Susanna Holappa

Various thermally responsive block and graft copolymers based on poly(Nisopropylacrylamide) (PNIPA) have been synthesised. Poly(ethyleneoxides) (PEO) with different chain lengths were used as hydrophilic blocks and grafts. The graft copolymers were synthesised in two steps. Firstly, two functional copolymers were prepared by free radical polymerisation of N-isopropylacrylamide (NIPA) with eithe...

2010
Rajeev Kr. Sharma Jashbir Singh Ghanshyam S. Chauhan

In order to develop novel polymeric supports based on cellulosics, cellulose extracted from pine needles, a perennial resource material available in huge quantities as waste, was graft copolymerized with vinyl monomers. Cellulose, cellulose derivatives, and their graft copolymers with highest percent grafting (Pg) were used as supports for immobilization of an industrially important protease en...

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