Tunable LCST behavior of poly(N-isopropylacrylamide/ionic liquid) copolymers

被引：228

作者：

Jain, Kamiya ^{[1
]}

Vedarajan, Raman ^{[1
]}

Watanabe, Masaki ^{[2
]}

Ishikiriyama, Mamoru ^{[2
]}

Matsumi, Noriyoshi ^{[1
]}

机构：

[1] Japan Adv Inst Sci & Technol, Sch Mat Sci, Nomi, Ishikawa 9231292, Japan

[2] Toyota Motors Corp, Toyota, Japan

来源：

POLYMER CHEMISTRY | 2015年 / 6卷 / 38期

关键词：

PHASE-TRANSITION; TEMPERATURE; DIBLOCK; PH;

D O I：

10.1039/c5py00998g

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Poly(N-isopropylacrylamide), PNIPAM, is a thermoresponsive polymer widely known for its lower critical solution temperature (LCST) phenomenon at 32 degrees C in aqueous solutions. Precise tuning of the LCST of PNIPAM to a broader temperature range offers a larger window of applications especially in the field of biotechnology and nanotechnology. A series of free radical random copolymerizations between N-isopropylacrylamide (NIPAM) and various imidazolium based ionic liquids (ILs) were conducted. IL structures were varied in terms of their alkyl chain length at the N-3 (or N-1) position of the imidazolium ring and counter anion. The LCST behavior of the aqueous solutions of the copolymers was investigated through UV-VIS transmission measurements. The results confirm that introduction of IL into the PNIPAM offers a wide range of LCST behaviors with a synergism between the hydrophobic part of the ionic liquid and the basic strength of the counter anion, probably by varying the hydrogen bonding abilities of the copolymer.

引用

页码：6819 / 6825

页数：7

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