Poly(N-isopropylacrylamide) hydrogels with improved shrinking kinetics by RAFT polymerization

被引:107
作者
Liu, QF
Zhang, P
Qing, AX
Lan, YX
Lu, MG
机构
[1] Chinese Acad Sci, Guangzhou Inst Chem, Guangzhou 510650, Peoples R China
[2] Chinese Acad Sci, Grad Sch, Beijing, Peoples R China
关键词
hyperbranched; N-isopropylacrylamide; reversible addition fragmentation chain transfer (RAFT);
D O I
10.1016/j.polymer.2006.02.006
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Functional poly(N-isopropylacrylamide) (PNIPAM) hydrogels were prepared by reversible addition fragmentation chain transfer (RAFT) polymerization of N-isopropylacrylamide (NIPAM) in the presence of N,N-methylenebisacylamide (BIS) as a cross-linker and 4-cyanopentanoic acid dithiobenzoate as chain transfer reagent (CTA). The swelling behaviors were investigated and the hydrogels by RAFT polymerization (RAFT gels) showed accelerated shrinking kinetics and higher swelling ratio comparing with conventional hydrogel (CG). It could be attributed to the presence of dangling chains mainly caused by CTA, which could retard the crosslinking reaction rate greatly. Another CTA, 3-(trithiocarbonyl) propanoic acid, was adopted to further investigate the effect of CTA. It showed the similar effect except the different accelerated degree to the shrinking kinetics. Furthermore, the living character of the RAFT process was used to polymerize a new batch of monomer (NIPAM) from functional RAFT gels to introduce grafted structure. The PNIPAM-g-PNIPAM hydrogels indicted further accelerated shrinking kinetics than functional backbone hydrogels. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2330 / 2336
页数:7
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