Synthesis and properties of poly(phenylene ether) diblock copolymers bearing acid substituents

Kenichi Oyaizu*, Hidenori Murata, Daisuke Yoshii, Takehiro Ishikawa, Makoto Yuasa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The oxidative polymerization of 2,6-dimethylphenol is a convenient engineering method to synthesize poly (2,6-dimethyl-1,4-phenylene ether) (PPE) as a high-performance engineering plastic in industrial fields. Recently, we reported the novel synthesis of PPE diblock copolymers based on the analysis of the polymerization mechanism. We report the preparation of PPE diblock copolymers bearing carboxylic or sulfonic acid as acid substituents. The resulting acid substituented PPE block copolymers, poly(2,6-dimethyl-1,4-phenylene ether-block-2-carboxy-6-methyl-1,4-phenylene ether) 3 and poly[2,6-dimethyl-1,4-phenylene ether-block-2-phenyl-6-(4-sulfophenyl)-1,4-phenylene ether] 5, were applied as polymer electrolyte membranes for fuel cells. 3 and 5 were soluble in polar organic solvents such as N,N-dimethylformamide, dimethylsulfoxide, and THF and gave tough membranes by casting. Sulfonated polymer 5 membrane showed high ion exchange capacity and high oxidative stability. The results suggested that the acid substituents attached onto the pendant phenyl groups were more stable than those on main chains.

Original languageEnglish
Pages (from-to)145-149
Number of pages5
Issue number2
Publication statusPublished - 2008 Feb
Externally publishedYes


  • Block copolymer
  • Fuel cell
  • Oxidative polymerization
  • Poly(phenylene ether)
  • Polymer electrolyte

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Materials Science (miscellaneous)
  • Environmental Science(all)
  • Polymers and Plastics


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