Antioxidative Dopant for Thermal-Resisting Polypyrrole and Its Mechanism

Shinji Takeoka, Tomitaro Hara, Kazuaki Fukushima, Kimihisa Yamamoto, Eishun Tsuchida

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    In order to improve the thermal stability of the electric conductivity of polypyrrole (PPy), a series of aromatic sulfonate derivatives having acid-type substitute groups, such as -COOH, -OH, and -SO 3H, were used as dopants. The PPy doped with these dopants showed excellent thermal stability of their electric conductivity, even at 150 °C in air. Especially, 2-hydroxy-5-sulfobenzoic acid, having one -COOH and one -OH, provided the highest thermal stability; the doped PPy maintained 95% of its initial conductivity, even after heating for 8 h at 150 °C in air. Furthermore, the PPy showed 20-times higher stability against long-term heating at 125 °C for 1000 h in comparison with PPy doped with p-methylbenzenesulfonic acid, which is conventionally used to provide high thermal stability. The thermal-stabilization mechanism has suggested that dopants having acidic substituents should suppress proton dissociation from the N-position of the PPy main chain and keep the π-conjugation structure by supplying a proton from the acidic groups. Such a proton supplement was confirmed by the IR spectroscopy of deuterized PPy.

    Original languageEnglish
    Pages (from-to)1471-1476
    Number of pages6
    JournalBulletin of the Chemical Society of Japan
    Volume71
    Issue number6
    Publication statusPublished - 1998 Jun

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    Doping (additives)
    Thermodynamic stability
    Protons
    Acids
    Heating
    Air
    Hot Temperature
    polypyrrole
    Infrared spectroscopy
    Stabilization
    Derivatives

    ASJC Scopus subject areas

    • Chemistry(all)

    Cite this

    Takeoka, S., Hara, T., Fukushima, K., Yamamoto, K., & Tsuchida, E. (1998). Antioxidative Dopant for Thermal-Resisting Polypyrrole and Its Mechanism. Bulletin of the Chemical Society of Japan, 71(6), 1471-1476.

    Antioxidative Dopant for Thermal-Resisting Polypyrrole and Its Mechanism. / Takeoka, Shinji; Hara, Tomitaro; Fukushima, Kazuaki; Yamamoto, Kimihisa; Tsuchida, Eishun.

    In: Bulletin of the Chemical Society of Japan, Vol. 71, No. 6, 06.1998, p. 1471-1476.

    Research output: Contribution to journalArticle

    Takeoka, S, Hara, T, Fukushima, K, Yamamoto, K & Tsuchida, E 1998, 'Antioxidative Dopant for Thermal-Resisting Polypyrrole and Its Mechanism', Bulletin of the Chemical Society of Japan, vol. 71, no. 6, pp. 1471-1476.
    Takeoka, Shinji ; Hara, Tomitaro ; Fukushima, Kazuaki ; Yamamoto, Kimihisa ; Tsuchida, Eishun. / Antioxidative Dopant for Thermal-Resisting Polypyrrole and Its Mechanism. In: Bulletin of the Chemical Society of Japan. 1998 ; Vol. 71, No. 6. pp. 1471-1476.
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