Sulfonated block polyimide copolymers as a proton-conductive membrane

Naoki Asano, Kenji Miyatake, Masahiro Watanabe*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)


The synthesis of a series of block sulfonate polyimide (SPI) ionomers to control hydrophilic and hydrophobic phase separation for the improvement of the proton conductivity at low humidity conditions, is presented. The new block SPI-B ionomer membranes showed chemical stability comparable to that of SPI-R equivalent. The block/block copolymer SPI-B150/150 membrane, containing long block segments in both the hydrophilic and the hydrophobic components, showed the highest proton conductivity. STEM observations confirmed widespread and well-connected hydrophilic domains, which proves the high proton-transporting properties of the SPI-B150/150.

Original languageEnglish
Pages (from-to)2744-2748
Number of pages5
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Issue number8
Publication statusPublished - 2006 Apr 15
Externally publishedYes


  • Block copolymers
  • Conducting polymers
  • Fuel cells
  • Ionomers
  • Membranes
  • Polyimides

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry


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