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Proton conducting crosslinked polymer electrolyte membranes based on SBS block copolymer

Authors

  • Dong Kyu Roh,

    1. Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, South Korea
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  • Jong Kwan Koh,

    1. Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, South Korea
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  • Won Seok Chi,

    1. Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, South Korea
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  • Yong Gun Shul,

    1. Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, South Korea
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  • Jong Hak Kim

    Corresponding author
    1. Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, South Korea
    • Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, South Korea===

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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 SOinline image 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. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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