Sulfonated poly(arylene ether phosphine oxide ketone) block copolymers as oxidatively stable proton conductive membranes

Junpei Miyake, Masahiro Watanabe, Kenji Miyatake

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

The introduction of triphenylphosphine oxide moiety into the hydrophilic segments of aromatic multiblock copolymers provided outstanding oxidative stability and high proton conductivity. Our designed multiblock copolymers are composed of highly sulfonated phenylene ether phosphine oxide ketone units as hydrophilic blocks and phenylene ether biphenylene sulfone units as hydrophobic blocks. High molecular weight block copolymers (Mw = 204-309 kDa and Mn = 72-94 kDa) with different copolymer compositions (number of repeat unit in the hydrophobic blocks, X = 30, and that of hydrophilic blocks, Y = 4, 6, or 8) were synthesized, resulting in self-standing, transparent, and bendable membranes by solution-casting. The block copolymer membranes exhibited well-developed hydrophilic/hydrophobic phase separation, high proton conductivity, and excellent oxidative stability due to the highly sulfonated hydrophilic blocks, which contained phenylene rings with sulfonic acid groups and electron-withdrawing phosphine oxide or ketone groups.

Original languageEnglish
Pages (from-to)5903-5907
Number of pages5
JournalACS Applied Materials and Interfaces
Volume5
Issue number13
DOIs
Publication statusPublished - 2013 Jul 10
Externally publishedYes

Keywords

  • block copolymers
  • fuel cells
  • oxidative stability
  • phosphine oxide groups
  • proton conductive membranes

ASJC Scopus subject areas

  • Materials Science(all)

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