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Dramatic Effect of Dispersed Carbon Nanotubes on the Mechanical and Electroconductive Properties of Polymers Derived from Ionic Liquids

Authors

  • Takanori Fukushima Dr.,

    1. Aida Nanospace Project, ERATO-SORST Japan Science and Technology Agency, National Museum of Emerging Science and Innovation, 2-41 Aomi, Koto-ku, Tokyo 135-0064, Japan, Fax: (+81) 3-3570-9183
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  • Atsuko Kosaka,

    1. Aida Nanospace Project, ERATO-SORST Japan Science and Technology Agency, National Museum of Emerging Science and Innovation, 2-41 Aomi, Koto-ku, Tokyo 135-0064, Japan, Fax: (+81) 3-3570-9183
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  • Yohei Yamamoto Dr.,

    1. Aida Nanospace Project, ERATO-SORST Japan Science and Technology Agency, National Museum of Emerging Science and Innovation, 2-41 Aomi, Koto-ku, Tokyo 135-0064, Japan, Fax: (+81) 3-3570-9183
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  • Takuji Aimiya,

    1. Department of Chemistry and Biotechnology, School of Engineering and Center for NanoBio Integration, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan, Fax: (+81) 3-5841-7310
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  • Shunsuke Notazawa Dr.,

    1. Department of Material Chemistry, Faculty of Engineering, Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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  • Toshikazu Takigawa Prof.,

    1. Department of Material Chemistry, Faculty of Engineering, Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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  • Tamotsu Inabe Prof.,

    1. Division of Chemistry, Graduate School of Science, Hokkaido University, 10-8 Kita, Kita-ku, Sapporo, 060-0810, Japan
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  • Takuzo Aida Prof.

    1. Department of Chemistry and Biotechnology, School of Engineering and Center for NanoBio Integration, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan, Fax: (+81) 3-5841-7310
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Abstract

Free-radical polymerization of an imidazolium ion-based ionic liquid bearing a methacrylate group, gelling with single-walled carbon nanotubes (SWNTs), allows fabrication of a mechanically reinforced, electroconductive soft material (bucky plastic). A film sample of this material displays an excellent conductivity of 1 S cm−1 and a 120-fold enhancement of the Young’s modulus at a 7 wt % content of SWNTs. The conductivity is temperature-dependent in the range 5–300 K, suggesting that the conductive process involves carrier hopping. Scanning electron and atomic force micrographs of a bucky plastic film display the presence of crosslinked networks consisting of finely dispersed SWNTs. Such nanotube networks, developed in the polymer matrix, likely suppress slipping of entrapped polymer molecules via a strong interfacial interaction and also facilitate intertubular carrier transport. Although a bucky plastic derived from a vinylimidazolium ion-based ionic liquid monomer shows a comparable conductivity to that of the methacrylate version, the film is brittle irrespective of the presence or absence of SWNTs.

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