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

Daomin Min, Shengtao Li, Naoshi Hirai, Yoshimichi Ohki

研究成果: Article査読

24 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号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
6
DOI
出版ステータスPublished - 2016 12月

ASJC Scopus subject areas

  • 電子工学および電気工学

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