Proton conducting crosslinked polymer electrolyte membranes based on SBS block copolymer

Dong Kyu Roh, Jong Kwan Koh, Won Seok Chi, Yong Gun Shul, Jong Hak Kim

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A series of crosslinked polymer electrolyte membranes with controlled structures were prepared based on poly(styrene-b-butadiene-b-styrene) (SBS) triblock copolymer and a sulfonated monomer, 2-sulfoethyl methacrylate (SEMA). SBS membranes were thermally crosslinked with SEMA in the presence of a thermal-initiator, 4,4′-azobis(4-cyanovaleric acid) (ACVA), as confirmed by FT-IR spectroscopy. The water uptake and ion exchange capacity (IEC) of membranes increased almost linearly with SEMA concentrations due to the increase of SO 3- groups. However, the proton conductivity of membranes increased linearly up to 33 wt % of SEMA, above which it abruptly jumped to 0.04 S/cm presumably due to the formation of well-developed proton channels. Microphase-separated morphology and amorphous structures of crosslinked SBS/SEMA membranes were observed using wide angle X-ray scattering (WAXS), small angle X-ray scattering (SAXS), and transmission electron microscopy (TEM). The membranes exhibited good mechanical properties and high thermal stability up to 250°C, as determined by a universal testing machine (UTM) and thermal gravimetric analysis (TGA), respectively.

Original languageEnglish
Pages (from-to)3283-3291
Number of pages9
JournalJournal of Applied Polymer Science
Volume121
Issue number6
DOIs
Publication statusPublished - 2011 Sep 15

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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