Synthesis and properties of polyimide ionomers containing sulfoalkoxy and fluorenyl groups

Tomohiro Yasuda, Kenji Miyatake, Michiko Hirai, Masato Nanasawa, Masahiro Watanabe*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)


A series of sulfopropylated and sulfobutylated polyimide copolymers containing fluorenyl groups, SPI-4, were synthesized to investigate the effect of alkyl side chains on the properties (stability, mechanical strength, water uptake, and proton conductivity) of the polymimide electrolyte membranes. SPI-4 showed much better hydrolytic stability (in 10% MeOH aq at 100°C) than the main chain sulfonated polyimide, SPI-1. Tough, flexible, and ductile membranes were obtained from these copolymers. At high relative humidity all the SPI-4 membranes showed high mechanical properties (>34 MPa of the maximum stress) and proton conductivity (>0.1 Scm-1). These properties are comparable to or even better than those of the perfluorosulfonic acid ionomer (Nafion 112). The new polyimide ionomers have proved to be a possible candidate as polymer electrolyte membrane for PEFCs and DMFCs.

Original languageEnglish
Pages (from-to)4439-4445
Number of pages7
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Issue number19
Publication statusPublished - 2005 Oct 1
Externally publishedYes


  • Conducting polymers
  • Ionomers
  • Membranes
  • Polyimides
  • Proton conduction

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry


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