Issue 5, 2015

Ionic liquid-based random copolymers: a new type of polymer electrolyte with low glass transition temperature

Abstract

A new type of polymer electrolyte has been prepared from the side-chains of ionic liquids (IL) and an analogue of ethylene oxide (EO) directly grafted on a polyethylene oxide backbone. By tuning the two types of monomer composition during polymerization, a series of copolymers with different monomer ratios between IL : EO = 8 : 1 to 1 : 4 have been synthesized. All copolymerized polyionic liquids showed higher ionic conductivity than an IL homopolymer. By choosing a composition with IL : EO = 1 : 1, the corresponding polymer gave the highest conductivity, 1.2 × 10−4 S cm−1 at room temperature, compared to 9.3 × 10−6 S cm−1 from a homopolymer. We attribute this to one order of magnitude improvement of conductivity from a low glass transition temperature (Tg) below −40 °C.

Graphical abstract: Ionic liquid-based random copolymers: a new type of polymer electrolyte with low glass transition temperature

Article information

Article type
Paper
Submitted
29 out 2014
Accepted
27 nov 2014
First published
28 nov 2014

RSC Adv., 2015,5, 3135-3140

Ionic liquid-based random copolymers: a new type of polymer electrolyte with low glass transition temperature

H. Hu, W. Yuan, Z. Jia and G. L. Baker, RSC Adv., 2015, 5, 3135 DOI: 10.1039/C4RA13432J

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