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SPES-SiO2 hybrid proton exchange membranes from in situ sol–gel process of negatively charged alkoxysilane

Authors

  • Cuiming Wu,

    1. School of Chemical Engineering, Hefei University of Technology, Hefei 230009, People's Republic of China
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  • Xinle Xiao,

    1. School of Chemical Engineering, Hefei University of Technology, Hefei 230009, People's Republic of China
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  • Wenchang Xiao,

    1. Laboratory of Functional Membranes, School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, People's Republic of China
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  • Yonghui Wu,

    1. Laboratory of Functional Membranes, School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, People's Republic of China
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  • Peng Cui,

    1. School of Chemical Engineering, Hefei University of Technology, Hefei 230009, People's Republic of China
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  • Tongwen Xu

    Corresponding author
    1. Laboratory of Functional Membranes, School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, People's Republic of China
    • Laboratory of Functional Membranes, School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, People's Republic of China
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Abstract

One type of negatively charged alkoxysilane, that is, sulfonated 3-(mercaptopropyl)trimethoxysilane (SMPTS), has been developed from 3-(mercaptopropyl)trimethoxysilane (MPTS) and hydrogen peroxide. SMPTS is used to modify sulfonated poly(ether sulfone) (SPES) through in situ sol–gel process. The membranes with proper SMPTS dosage show enhanced ion exchange capacity (IEC), hydrophilicity, mechanical strength, chemical stability, and proton conductivity, which prove that SMPTS is an effective modifier for preparing proton-exchange hybrid membranes. With MPTS of 5–20%, the hybrid membranes exhibit IEC 1.34–1.50 mmol g−1, thermal stability 264–316°C, and proton conductivity 0.0015–0.0102 S cm−1 and thus recommended for potential application in fuel cells. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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