Synthesis, proton conductivity and water stability of sulfonated polyimides from a new sulfonated sulfonyl-containing diamine monomer

Kang Cheng Chen*, Xiao Xia Guo, Hong Jie Xu, Jian Hua Fang, Huan Chen, Bing Huan Hu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A sulfonated diamine monomer, 4,4'-bis (4-aminophenoxy) diphenyl sulfone-3,3'-disulfon-ic acid (BAPPSDS), was synthesized via two-step reactions. A series of sulfonated (co) polyimides with controlled ion exchange capacities (IECs) were prepared from 1,4,5,8-naphthalenetetracarboxylic dian-hydride (NTDA), BAPPSDS, and common nonsulfonated diamines in m-cresol in the presence of triethyl-amine and benzoic acid at 180°C. The resulting sulfonated copolyimides show good solubility and high thermal stability. At high relative humidities the sulfonated copolyimide membranes exhibit high proton conductivities which are comparable to that of Nafion 117. The water stability is strongly dependent on both the IEC level and the configuration of the sulfonated diamine. Polyimide membranes with high proton conductivity as well as good water stability were developed.

Original languageEnglish
Pages (from-to)297-301
Number of pages5
JournalShanghai Jiaotong Daxue Xuebao/Journal of Shanghai Jiaotong University
Volume41
Issue number2
Publication statusPublished - Feb 2007
Externally publishedYes

Keywords

  • 4,4'-bis (4-aminophenoxy) diphenyl sulfone-3,3'-disulfonic acid
  • Proton conductivity
  • Sulfonated polyimide
  • Water stability

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