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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

Design of Ionic Liquid-Derived Polyelectrolyte Gels Toward Reversible Water Absorption/Desorption System Driven by Small Temperature Change

Yuki Deguchi A B , Yuki Kohno A B and Hiroyuki Ohno A B C
+ Author Affiliations
- Author Affiliations

A Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.

B Functional Ionic Liquid Laboratories, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.

C Corresponding author. Email: ohnoh@cc.tuat.ac.jp

Australian Journal of Chemistry 67(11) 1666-1670 https://doi.org/10.1071/CH14038
Submitted: 27 January 2014  Accepted: 4 March 2014   Published: 24 March 2014

Abstract

Suitably designed polyelectrolytes derived from tributyl-n-alkylphosphonium 3-sulfopropylmethacrylate-type ionic liquid (IL) monomers undergo a lower critical solution temperature (LCST)-type phase transition, and their transition temperature is a function of the alkyl chain length on the phosphonium cations. Based on this finding, we have successfully prepared chemically cross-linked polyelectrolyte gels, poly(IL) gels, to show the LCST-type phase change. The hydrated state of the prepared poly(IL) gels varied widely with temperature. They desorbed water by elevating the temperature only by a few degrees. Their transition temperature was finely controlled by mixing the composition of IL monomers with different alkyl chain lengths.


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