Novel triblock copolymers synthesized via radical telomerization of N-isopropylacrylamide in the presence of polypseudorotaxanes made from thiolated PEG and α-CDs

被引：33

作者：

Yu, Huaiqing ^{[1
]}

Feng, Zeng-guo ^{[1
]}

Zhang, Ai-ying ^{[1
]}

Hou, Dandan ^{[1
]}

Sun, Ling-gang ^{[1
]}

机构：

[1] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China

来源：

POLYMER | 2006年 / 47卷 / 17期

基金：

中国国家自然科学基金;

关键词：

alpha-cyclodextrin; polyrotaxane; poly(N-isopropylacrylamide);

D O I：

10.1016/j.polymer.2006.06.048

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A protocol for the preparation of novel triblock copolymers comprising a polyrotaxane center block and outer blocks of poly(N-isopropylacrylamide) (PNIPAAm) as bulky stoppers was developed, in which N-isopropylacrylamide was allowed to telomerize in the presence of polypseudorotaxanes made from the self-assembly of thiol end-capped PEG with a varying amount of alpha-CDs under UV irradiation in aqueous solution. The molecular structure of the resulting copolymers was characterized in detail by H-1 NMR, FTIR, XRD, TG and DSC analyses. It was demonstrated that the PNIPAAm blocks are successfully attached to the two terminals of the polypseudorotaxanes and each block having the minimum 7 NIPAAm units seems long and bulky enough to efficiently impede the dethreading of alpha-CDs from the PEG axle to give rise to the triblock polyrotaxane-containing copolymers. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：6066 / 6071

页数：6

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