Influence of Confined Polymer Structure on Proton Transport Property in Sulfonated Polyimide Thin Films

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  • KRISHNAN Karthik
    School of Materials Science, Japan Advanced Institute of Science and Technology
  • YAMADA Tomoaki
    Department of Materials, Physics and Energy Engineering, Nagoya University
  • IWATSUKI Hiroko
    Department of Molecular Design & Engineering, Graduate School of Engineering, Nagoya University
  • HARA Mitsuo
    Department of Molecular Design & Engineering, Graduate School of Engineering, Nagoya University
  • NAGANO Shusaku
    Nagoya University Venture Business Laboratory, Nagoya University
  • OTSUBO Kazuya
    Division of Chemistry, Graduate School of Science, Kyoto University
  • SAKATA Osami
    Synchrotron X-ray Station at SPring-8, National Institute for Materials Science (NIMS)
  • FUJIWARA Akihiko
    Japan Synchrotron Radiation Research Institute (JASRI), SPring-8
  • KITAGAWA Hiroshi
    Division of Chemistry, Graduate School of Science, Kyoto University
  • NAGAO Yuki
    School of Materials Science, Japan Advanced Institute of Science and Technology

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The organized structure and proton transport property in sulfonated polyimide (SPI) thin film have been studied, much less is known at the interfacial charge transport during confinement of such materials. The proton conductivity of SPI thin film is correlated well with the highly oriented polymer structures as determined by infrared (IR) p-polarized multiple-angle incidence resolution spectrometry (p-MAIRS) and in situ RH dependent synchrotron grazing incidence X-ray diffraction (GI-XRD). The high proton conductivity of 2.8 × 10−1 S cm−1 at 80°C and 90% RH was achieved in the highly oriented SPI thin film. In contrast, the bulk SPI showed the drop of conductivity value at high relative humidity region, which is due to the significant structural disorder accompanied by the strong interaction between the sulfonic acid side chains and water molecules.

収録刊行物

  • Electrochemistry

    Electrochemistry 82 (10), 865-869, 2014

    公益社団法人　電気化学会

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