Comb-shaped 2-Methylimidazolium Poly(arylene ether sulfone) Anion Exchange Membranes with High Alkaline Stability |
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Authors: | ZHANG Yurong GE Xiaoguang ZHAO Chengji NA Hui |
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Institution: | Alan G. MacDiarmid Institute, College of Chemistry, Jilin University, Changchun 130012, P. R. China |
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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. |
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Keywords: | Comb-shaped structure Imidazolium functionalized poly (arylene ether sulfone) Alkaline stability Membrane |
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