Synthesis and properties of poly(arylene ether sulfone) anion exchange membranes with pendant benzyl-quaternary ammonium groups

POLYMER

卷:121

Article

Shi, Qian¹  Chen, Pei¹  Zhang, Xueliang¹  Weng, Qiang¹  Chen, Xinbing¹  An, Zhongwei^1,2 

[1] Shaanxi Normal Univ, Sch Mat Sci & Engn, Key Lab Appl Surface & Colloid Chem MOE, Xian 710062, Shaanxi, Peoples R China

[2] Xian Modern Chem Res Inst, Xian 710065, Shaanxi, Peoples R China

关键词: Difluoro aromatic ketone monomer;    Side-chain type poly(arylene ether sulfone);    Anion exchange membrane;    Hydroxide conductivity;    Alkaline stability;   

DOI  :  10.1016/j.polymer.2017.06.004

来源: Elsevier

【 摘 要 】

A series of side-chain type poly(arylene ether sulfone)s (sPAE) bearing pendant 3,5-dimethylphenyl groups are prepared via high temperature polycondensation reaction of 4,4'-biphenol, 4,4'-difluorodiphenyl sulfone, and new difluoro aromatic ketone monomer, (2,6-difluorophenyl) [3-[(3,5dimethylphenyl) methyl]-5-methylphenyl] methanone. The sPAE-based anion exchange membranes (sQPAE(x/y)) containing pendant benzyl-quaternary ammonium groups are obtained by the corresponding bromomethylation of sPAE and subsequent quaternization. The obtained side-chain type membranes sQPAE(x/y) display anisotropic membrane swelling, high alkaline stability and good hydroxide conductivity in the range of 42.7e61.5 mS cm(-1) at 80 degrees C, taking their low IECs of 0.97-1.29 mequiv g(-1) into consideration. Their high hydroxide conductivity is attributed to the greater length and dense distribution of the pendant benzyl-quaternary ammonium groups. Besides, the crosslinked membrane sCQPAE(1/4) is prepared via quaternization reaction between brominated sPAE and crosslinker. Compared to the uncrosslinked membrane, sCQPAE(1/4) with same IEC shows lower membrane swelling, better oxidative stability, higher conductivity and chemical stability at 80 degrees C. (C) 2017 Elsevier Ltd. All rights reserved.

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