Effect of crosslinking on the properties of partially fluorinated anion exchange membranes

Daniel Koronka, Ahmed Mohamed Ahmed Mahmoud, Kenji Miyatake

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A series of crosslinked, ammonium-functionalized, and partially fluorinated copolymers have been prepared and evaluated as anion exchange membranes. In order to investigate the effect of crosslinking on the membrane properties, precursor copolymers containing chloromethyl groups were crosslinked with various aliphatic diamines followed by quaternization with monoamines. Crosslinking was effective in lowering water absorbability at no expense of high hydroxide ion conductivity of the membranes. By tuning the degree of crosslinking (20 mol %) and crosslinker chain length (C6 and C8), the highest ion conductivity of 73 mS/cm (at 80°C in water) was achieved. Furthermore, alkaline stability of the membranes was also improved by the crosslinking; the remaining ion conductivity after the stability test (in 1 M potassium hydroxide at 80°C) was 8.2 mS/cm (after 1000 h) for the C6 crosslinked membrane and 1 mS/cm (after 500 h) for the uncrosslinked membrane, respectively. The ammonium groups attached with the crosslinkers seemed more alkaline stable than the uncrosslinked benzyltrimethylammonium groups, while the polymer main chain was intact under the harsh alkaline conditions.

Original languageEnglish
Pages (from-to)1059-1069
Number of pages11
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume57
Issue number10
DOIs
Publication statusPublished - 2019 May 15
Externally publishedYes

Keywords

  • ammonium groups
  • crosslinking
  • fluorinated polymers
  • ion conductive polymers
  • membranes

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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