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Proton conductive polyimide ionomer membranes: Effect of NH, OH, and COOH groups

Authors

  • Jumpei Saito,

    1. Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4 Takeda, Kofu 400-8510, Japan
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  • Manabu Tanaka,

    1. Fuel Cell Nanomaterials Center, University of Yamanashi, 6 Miyamae, Kofu 400-0021, Japan
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  • Kenji Miyatake,

    Corresponding author
    1. Fuel Cell Nanomaterials Center, University of Yamanashi, 6 Miyamae, Kofu 400-0021, Japan
    2. Division of Fuel Cell Research, Clean Energy Research Center, University of Yamanashi, 4 Takeda, Kofu 400-8510, Japan
    • Fuel Cell Nanomaterials Center, University of Yamanashi, 6 Miyamae, Kofu 400-0021, Japan
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  • Masahiro Watanabe

    Corresponding author
    1. Fuel Cell Nanomaterials Center, University of Yamanashi, 6 Miyamae, Kofu 400-0021, Japan
    • Fuel Cell Nanomaterials Center, University of Yamanashi, 6 Miyamae, Kofu 400-0021, Japan
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Abstract

A new series of sulfonated polyimide (SPI) copolymers containing NH, OH, or COOH groups were synthesized by the polycondensation of 1,4,5,8-naphthalnetetracarboxylic dianhydride, 3,3′-bis(sulfopropoxy)-4,4′-diaminobiphenyl, and 3-(4-aminophenyl)-5-(3-aminophenyl)-1H-1,2,4-triazole (SPI-8-m), 3,5-bis(4-aminophenyl)-1H-1,2,4-triazole (SPI-8-p), 3,6-diaminocarbazole (SPI-9), 3,5-diamino-1H-1,2,4-triazole (SPI-10), bis(3-aminopropyl)-amine (SPI-11), 2,6-diaminopurine (SPI-12), 2,4-diamino-6-hydroxyprymidine (SPI-13), or 3,5-bis(4-aminophenoxy)benzoic acid (SPI-14). The obtained SPIs were soluble in polar organic solvents and gave tough and flexible membranes by solution casting. The SPI membranes having NH and COOH groups showed high thermal (decomposition temperature ≈200 °C) and mechanical (maximum stress >22 MPa) stability. Introducing NH groups, especially triazole and carbazole groups, was effective in improving proton conductive properties of SPI membranes at low humidity. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 2846–2854, 2010

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