Comparison of Dielectric Properties of Olefin Thermosetting Polydicyclopentadiene and Epoxy Resin

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  • Masuzaki Yuki
    Department of Electrical Engineering and Bioscience, Waseda University
  • Ohki Yoshimichi
    Department of Electrical Engineering and Bioscience, Waseda University Research Institute for Materials Science and Technology, Waseda University
  • Tian Fuqiang
    School of Electrical Engineering, Beijing Jiaotong University
  • Kozako Masahiro
    Department of Electrical and Electronic Engineering, Kyushu Institute of Technology
  • Kamei Nobuhito
    RIMTEC Corporation

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Other Title
  • オレフィン系熱硬化性ポリジシクロペンタジエンとエポキシ樹脂の誘電特性の比較
  • オレフィンケイ ネツ コウカセイ ポリジシクロペンタジエン ト エポキシ ジュシ ノ ユウデン トクセイ ノ ヒカク

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Complex permittivity spectra were obtained in a wide temperature and frequency range from 20 to 200°C and from 10-2 to 105 Hz for polydicyclopentadiene resin (PDCPD). For comparison, two epoxy resins, one with a similar glass transition temperature (Tg) to PDCPD and the other with a lower Tg, were used. As a result, PDCPD shows much smaller values of εr' and εr'' than the two epoxy resins in nearly the whole temperature and frequency range. The differences of εr' and εr'' between PDCPD and the epoxy resin with a similar Tg are also significant at low frequencies and at high temperatures. The increase in εr' is attributable to the accumulation of hetero space charges in front of the electrodes. On the other hand, the increase in εr'' is an indication of the increase in Joule heat caused by the enhanced charge transport. Therefore, the experiental results indicate that PDCPD possesses better electrical insulating properties than epoxy resin. Furthermore, analysis using complex electric modulus, which is the inverse of the complex permittivity, has revealed very clearly that both charge transport and dipolar orientation are much more difficult in PDCPD than the two epoxy resins.

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