Anion conductive aromatic polymers containing fluorenyl groups: Effect of the position and number of ammonium groups

Manai Shimada, Shigefumi Shimada, Junpei Miyake, Makoto Uchida, Kenji Miyatake

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Synthesis and properties of anion conductive aromatic block copolymers, QPE-bl-3, QPE-bl-3 M2, and M4, containing fluorenylidene biphenylene groups as scaffold for ammonium groups are described. These copolymers share the same main chain structure, but the position and the number of ammonium groups on a fluorenyl group differ. High molecular weight quaternized block copolymers were obtained via typical chloromethylation reaction or using preaminated monomers, and were well-characterized by 1H NMR spectra. Self-standing bendable membranes were obtained by solution casting. QPE-bl-3 M4 membranes containing four ammonium groups per hydrophilic repeat unit (highest ammonium density) in the hydrophilic block exhibited well developed phase-separated morphology, while QPE-bl-3 membranes containing two ammonium groups per hydrophilic repeat unit exhibited high anion conductivity. The highest anion conductivity (104 mS/cm) was obtained with QPE-bl-3 membrane (IEC = 2.1 meq/g) at 80 C in water. An H2/O2 alkaline fuel cell was operable with the membrane to achieve 62 mW/cm2 of the maximum power density at 161 mA/cm2 of the current density.

Original languageEnglish
Pages (from-to)935-944
Number of pages10
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume54
Issue number7
DOIs
Publication statusPublished - 2016 Apr 1
Externally publishedYes

Keywords

  • ammonium groups
  • block copolymers
  • fluorine
  • membranes
  • polyelectrolytes

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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