Imidazolium-functionalized poly(arylene ether sulfone) block copolymer as an anion exchange membrane for alkaline fuel cell

Anil H N Rao, Roshni Lilly Thankamony, Hyoung Juhn Kim, SukWoo Nam, Tae Hyun Kim

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An ethyl imidazolium-functionalized poly(arylene ether sulfone) (EI-PES) block copolymer was prepared as a novel anion exchange membrane. The EI-PES polymer was synthesized by polycondensation between the F- and OH-terminated oligomers, followed by benzylic bromination and imidazolium functionalization (homogeneous functionalization). The quaternary ammonium-functionalized PES (QA-PES) was also prepared by heterogeneous functionalization, and the properties were compared with EI-PES. The membrane obtained from EI-PES showed a well-defined phase separated morphology between hydrophobic and hydrophilic ionic units of the block copolymer. An IEC of 1.45 meq/g with hydroxide conductivity of 0.03 S/cm at r.t. was observed for EI-PES. The EI-PES membrane also displayed excellent dimensional, thermal, mechanical and chemical stabilities.

Original languageEnglish
Pages (from-to)111-119
Number of pages9
JournalPolymer (United Kingdom)
Issue number1
Publication statusPublished - 2013 Jan 8
Externally publishedYes



  • Anion exchange membrane
  • Block copolymer
  • Imidazolium-functionalized polymer

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

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