Comb-shaped 2-Methylimidazolium Poly(arylene ether sulfone) Anion Exchange Membranes with High Alkaline Stability

doi:10.1007/s40242-019-8199-1

Abstract

Abstract: A series of comb-shaped poly (arylene ether sulfone)s containing pendant 2-methyl-3-alkylimidazolium group (ImPAES-Cx, x=1, 6, 10) was prepared and characterized as novel anion exchange membranes. These ImPAES-Cx membranes were obtained by benzylic bromination and imidazolium functionalization. The characteristic nano-phase separation structure was formed in membranes with longer alkyl side chains, as confirmed by small-angle X-ray scattering. The nano-phase separation structures endowed ImPAES-Cx membranes with improved ionic conductivity, dimensional stability (at least 60% decrease water uptake and swelling ratio at 60℃) and mechanical properties, together with excellent alkaline stability. Especially, ImPAES-C6 membranes possessed enhanced hydroxide conductivity and chemical stability simultaneously. These results suggest that it is a feasible strategy to introduce appropriate length of alkyl side chains into anion exchange membranes (AEMs) to improve the performance.

Key words: Comb-shaped structure, Imidazolium functionalized poly (arylene ether sulfone), Alkaline stability, Membrane

ZHANG Yurong, GE Xiaoguang, ZHAO Chengji, NA Hui. Comb-shaped 2-Methylimidazolium Poly(arylene ether sulfone) Anion Exchange Membranes with High Alkaline Stability[J]. Chemical Research in Chinese Universities, 2019, 35(1): 150-156.

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