Dielectric spectroscopic analysis of degradation in ethylene-propylene-diene copolymer

Daomin Min, Shengtao Li, Naoshi Hirai, Yoshimichi Ohki

研究成果: Article

14 引用 (Scopus)

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Gamma-ray induced changes occurring in ethylene-propylene-diene copolymer (EPDM) were analyzed through its complex permittivity spectra. First, four different processes, namely, instantaneous polarization, hopping of ions, segmental relaxation, and dc conduction are found to contribute to the complex permittivity. By fitting the spectra to theoretical equations, it has become clear that the instantaneous polarization and ionic hopping become active by the irradiation, indicating that generation of oxidative products and mobile ions and occurrence of chain scission are induced by gamma rays. Furthermore, since both the thermal expansion and the contribution of the segmental relaxation to the permittivity become less with an increase in dose, it is assumed that crosslinking is induced by the gamma irradiation.

元の言語English
記事番号7823416
ページ(範囲)3620-3630
ページ数11
ジャーナルIEEE Transactions on Dielectrics and Electrical Insulation
23
発行部数6
DOI
出版物ステータスPublished - 2016 12 1

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ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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