Synthesis of superacid-modified poly(arylene ether sulfone)s via post-bromination

Takuya Shimura, Masahiro Watanabe, Kenji Miyatake

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A versatile synthetic method of superacid-modified poly(arylene ether sulfone)s via post-bromination has been developed. Three kinds of high molecular weight poly(arylene ether sulfone)s, in which differences lie in the main chain structures, were synthesized and brominated. Careful control of the reaction conditions enabled selective and quantitative bromination of the polymers. The bromo groups were converted to superacid groups via Ullmann coupling reaction to obtain the title ionomers (FSPE-1a, 1b, and 1c). The chemical structure and the ion exchange capacity (IEC) of the FSPE-1s were characterized by 1H and 19F NMR spectra. Tough, flexible, and transparent membranes with IEC ranging from 0.87 to 1.09 meq g-1 were obtained by solution casting. The FSPE-1 membranes showed comparable properties (chemical stability, phase-separated morphology, water absorbability, and proton conductivity,) to those of our previous version of the superacid-modified poly(arylene ether sulfone) (FSPE) synthesized from brominated monomers (pre-bromination method). The advantages of the post-bromination method have been proven by significant improvement in the mechanical strength of the FSPE-1 membranes since it could provide superacid-modified aromatic ionomers with much higher molecular weight.

Original languageEnglish
Pages (from-to)5199-5204
Number of pages6
JournalRSC Advances
Volume2
Issue number12
DOIs
Publication statusPublished - 2012 Jun 21
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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