Effect of ammonium groups on the properties and alkaline stability of poly(arylene ether)-based anion exchange membranes

Junpei Miyake, Keita Fukasawa, Masahiro Watanabe, Kenji Miyatake

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

Five kinds of ammonium groups functionalized partially fluorinated poly(arylene ether) block copolymer membranes were prepared for investigating the structure-property relationship as anion exchange membranes (AEMs). Consequently, the pyridine (PYR)-modified membrane showed the highest alkaline and hydrazine stability in terms of the conductivity, water uptake, and dry weight. The chloromethylated precursor block copolymers were reacted with amines, such as trimethylamine, N-butyldimethylamine, 1-methylimidazole, 1,2-dimethylimidazole, and PYR to provide the target quaternized poly(arylene ether)s. The structures of the polymers, as well as model compounds and oligomers were well characterized by 1H NMR spectra. The obtained AEMs were subjected to water uptake and hydroxide ion conductivity measurements and stabilities in aqueous alkaline and hydrazine media. The pyridinium-functionalized quaternized polymers membrane showed the highest alkaline and hydrazine stability with minor losses in the conductivity, water uptake, and dry weight. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 383-389 Five kinds of ammonium groups (TMA, BDMA, MIm, DMIm, and PYR)-modified partially fluorinated poly(arylene ether) block copolymer membranes are synthesized to elucidate properties that include water uptake, hydroxide ion conductivity, stabilities in aqueous alkaline, and hydrazine media for anion exchange membrane fuel cell applications. The PYR-QPE membrane shows the highest alkaline and hydrazine stability in terms of the conductivity, water uptake, and dry weight.

Original languageEnglish
Pages (from-to)383-389
Number of pages7
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume52
Issue number3
DOIs
Publication statusPublished - 2014 Feb 1
Externally publishedYes

Keywords

  • block copolymers
  • degradation
  • membranes
  • polycondensation
  • polyelectrolytes

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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