文献类型：期刊文献

中文题名：EFFECTS OF GELATION RETARDATION ON THERMAL RESPONSE BEHAVIOR OF PNIAPM GELS:A METHOD TO IMPROVE THEIR DESWELLING KINETICS

英文题名：EFFECTS OF GELATION RETARDATION ON THERMAL RESPONSE BEHAVIOR OF PNIAPM GELS:A METHOD TO IMPROVE THEIR DESWELLING KINETICS

作者：Qun-feng Liu[1];Si-dong Li[1];Ping Zhang[2];Yan-xun Lan[2];Man-geng Lu[2]

机构：[1]College of Science, Guangdong Ocean University, Zhanjiang 524088, China;[2]Guangzhou Institute of Chemistry, Chinese Academy of Sciences, P.O. Box 1122, Guangzhou 510650, China

年份：2007

卷号：25

期号：6

起止页码：635

中文期刊名：高分子科学：英文版

收录：CSTPCD、、Scopus、CSCD2011_2012、CSCD

语种：英文

中文关键词：链转移;水凝胶;动力学;移植物

外文关键词：Chain transfer; Hyperbranched; Graft; Hydrogels.

中文摘要：P(N-isopropylacrylamide)(PNIPAM)prepared by reversible addition fragmentation chain transfer(RAFT) polymerization exhibited gelation retardation.The intermediate before gelation was characterized and indicated the presence of branched or hyperbranched chains.The swelling behavior was investigated,and the gel by RAFT polymerization(RAFT gel)showed accelerated shrinking kinetics and higher swelling ratio comparing with conventional gels(CG).The study was extended to gels prepared by using 2-hydroxy-1-ethanethiol as chain transfer agent and by using low concentration solutions. The two systems also exhibited retardation effects and improved deswelling kinetics.The different swelling behaviors of these gels and CG could be attributed to the presence of dangling chains caused by gelation retardation.

外文摘要：P（N-isopropylacrylamide） （PNIPAM） prepared by reversible addition fragmentation chain transfer （RAFT） polymerization exhibited gelation retardation. The intermediate before gelation was characterized and indicated the presence of branched or hyperbranched chains. The swelling behavior was investigated, and the gel by RAFT polymerization （RAFT gel） showed accelerated shrinking kinetics and higher swelling ratio comparing with conventional gels （CG）. The study was extended to gels prepared by using 2-hydroxy- 1-ethanethiol as chain transfer agent and by using low concentration solutions. The two systems also exhibited retardation effects and improved deswelling kinetics. The different swelling behaviors of these gels and CG could be attributed to the presence of dangling chains caused by gelation retardation.