Graft-type poly(N-isopropylacrylamide-co-acrylic acid) microgels exhibiting rapid thermo- and pH-responsive properties

被引：59

作者：

Zhang, Jie ^{[1
]}

Chu, Liang-Yin ^{[1
,2
]}

Cheng, Chang-Jing ^{[1
]}

Mi, Dan-Feng ^{[1
]}

Zhou, Ming-Yu ^{[1
]}

Ju, Xiao-Jie ^{[1
]}

机构：

[1] Sichuan Univ, Sch Chem Engn, Chengdu 610065, Sichuan, Peoples R China

[2] Sichuan Univ, Inst Nanobiomed Technol & Membrane Biol, State Key Lab Biotherapy, Chengdu 610065, Sichuan, Peoples R China

来源：

POLYMER | 2008年 / 49卷 / 10期

基金：

中国国家自然科学基金; 高等学校博士学科点专项科研基金;

关键词：

graft copolymers; microgels; rapid response;

D O I：

10.1016/j.polymer.2008.03.040

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 novel graft-type poly(N-isopropylacrylamide-co-acrylic acid) (poly(NIPAM-co-AAc)) microgel with linear grafted poly(NIPAM-co-AAc) side chains was prepared by incorporating the dual stimuli-responsive chains into conventional copolymerized poly(NIPAM-co-AAc) backbones as side chains through a grafted modification of molecular structure. The grafted chains with unfettered ends can unfold and shrink freely in response to environmental stimuli. Due to the mobile nature and the tractive force of the grafted poly(NIPAM-co-AAc) side chains, the prepared microgels were verified to have a synchronously rapid thermo- and pH-response property. When the environmental temperature was increased suddenly from 25 degrees C to about 63 degrees C, the graft-type microgels in ultrapure water deswelled 95% by volume at best within 40 s but the normal-type microgels deswelled only 17% by volume within the same period. The analogous trends were observed in either alkaline OF acid buffered solution. The graft-type microgels may thus be very promising for use in many applications in which rapid responses to dual environmental stimuli are required. (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：2595 / 2603

页数：9

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