Synthesis and substituent effect of polyimide electrolyte membranes containing fluorenyl groups

Tomohiro Yasuda, Kenji Miyatake, Masahiro Watanabe

Research output: Contribution to conferencePaperpeer-review

Abstract

A series of polyimide copolymers containing o-subustituted sulfonated fluorenyl groups (SPI-6) or sulfonated trimethylphenylene groups (SPI-7) were synthesized with various hydrophobic diamine comonomer. For investigation of polymer electrolyte properties, membranes were fabricated by casting from polymer solution. SPI-7 membranes showed better water stability than SPI-6 under accelerated testing conditions (at 140°C for 24 h). Flexible aliphatic chains turned out to cause lower water stability of the polyimide electrolytes. Water uptake was somewhat higher for SPI-7 than SPI-6. Both SPI-6 and SPI-7 membranes showed high proton conductivity under humidified conditions. SPI-6 TFMBZ with the ion exchange capacity (IEC) of 1.91 meq/g showed the highest proton conductivity of 10-1 S/cm at 90% RH and 10-3 S/cm at 20% RH.

Original languageEnglish
Pages5028-5029
Number of pages2
Publication statusPublished - 2006
Externally publishedYes
Event55th Society of Polymer Science Japan Symposium on Macromolecules - Toyama, Japan
Duration: 2006 Sep 202006 Sep 22

Other

Other55th Society of Polymer Science Japan Symposium on Macromolecules
CountryJapan
CityToyama
Period06/9/2006/9/22

Keywords

  • Electrolyte
  • Fuel cell
  • Hydrolytic stability
  • Membrane
  • Proton conductivity
  • Sulfonated polyimide

ASJC Scopus subject areas

  • Engineering(all)

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