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Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (6): 1056-1061.doi: 10.1007/s40242-015-5236-6

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Anion Exchange Membranes Based on Chloromethylation of Fluorinated Poly(arylene ether)s

MEI Wenhai1,3, WANG Zhen1,2   

  1. 1. Laboratory of Polymer Composites Engineering, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China;
    2. State Key Laboratory of Polymer Physics and Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China;
    3. University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2015-06-15 Revised:2015-08-05 Online:2015-11-01 Published:2015-11-02
  • Contact: WANG Zhen E-mail:wangzhen@ciac.ac.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.51173178, 51473157, 21304093).

Abstract:

This report details the properties of fluorine-containing anion exchange membranes(AEMs) synthesized by chloromethylation and quaternization of fluorinated poly(arylene ether)s(FPAEs) based on decafluorobiphenyl and bisphenol A. Meanwhile, we compared their properties with those of their non-fluorinated counterparts, Udel-based AEMs. The reactivity of the chloromethylation of fluorinated poly(arylene ether)s was lowered by the strong electron-withdrawing group, per-fluorinated biphenyl residue. Therefore higher temperature, more chloromethylation reagent, and longer reaction time were needed in the chloromethylation of FPAEs. Because of the hydrophobicity of fluorine, the swelling of FPAEs was depressed. In the FPAE-based AEMs, the water uptake of FPAE-1 membrane(F-1) was just 30%. There is a strong correlation between water uptake and conductivity for both Udel- and FPAE-based AEMs. Among all the membranes, the water uptake and the conductivity of FPAE-3 membrane(F-3) could reach up to 100% and 13.47 mS/cm respectively at 30 ℃. The mechanical properties of FPAE-based AEMs at room temperature were worse than those of Udel-based ones because of the weak intermolecular interaction caused by the low polarizability of fluorine. However, their high temperature mechanical properties are better, which can be explained in terms of low swelling.

Key words: Anion exchange membrane, Fluorinated poly(arylene ether), Chloromethylation