Effects of crystallinity and electron mean-free-path on dielectric strength of low-density polyethylene

Yasuhiro Tanaka, Norihiro Ohnuma, Kunio Katsunami, Yoshimichi Ohki

    研究成果: Article

    42 引用 (Scopus)

    抄録

    The relation between crystallinity and the mean free path of high-energy electrons in low-density polyethylene (LDPE) and their effects on dielectric strength were studied. Thin LDPE films obtained by vacuum evaporation were annealed at temperatures between room temperature and 100°C. Crystallinity was measured by X-ray diffraction. Electrons were injected into the film by photoemission, and the energy of electrons emitted into vacuum through the film was analyzed to obtain their energy distribution. The mean free path was then calculated from the energy distribution. It was found that the crystallinity increases and the mean free path becomes longer as the annealing temperature increases. Dielectric strength was measured by applying an impulse voltage of 1.2/50 μs at room temperature and -50°C. It was found that the breakdown field decreases with an increase in annealing temperature at both measurement temperatures. Thus, increased crystallinity makes electron transport easier and the mean-free-path longer, resulting in a lower dielectric strength.

    元の言語English
    ページ(範囲)258-265
    ページ数8
    ジャーナルIEEE Transactions on Electrical Insulation
    26
    発行部数2
    DOI
    出版物ステータスPublished - 1991 4

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    Low density polyethylenes
    Electrons
    Temperature
    Annealing
    Vacuum evaporation
    Photoemission
    Temperature measurement
    Vacuum
    X ray diffraction
    Electric potential

    ASJC Scopus subject areas

    • Engineering(all)

    これを引用

    Effects of crystallinity and electron mean-free-path on dielectric strength of low-density polyethylene. / Tanaka, Yasuhiro; Ohnuma, Norihiro; Katsunami, Kunio; Ohki, Yoshimichi.

    :: IEEE Transactions on Electrical Insulation, 巻 26, 番号 2, 04.1991, p. 258-265.

    研究成果: Article

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