Degradation of Mechanical and Dielectric Properties of Flame-Retardant Ethylene Propylene Rubber by Thermal Aging

Hikaru Yamaguchi*, Hiroyuki Ishii, Naoshi Hirai, Yoshimichi Ohki

*この研究の対応する著者

研究成果: Article査読

6 被引用数 (Scopus)

抄録

Thermal degradation was performed at 175, 200, and 250 °C from 100 to 2000 h on flame-retardant ethylene propylene rubber (FR-EPR) with the same compositions as those used in the insulation of a safety-related cable in nuclear power plants. For these samples, indenter modulus (IM), elongation at break, tensile strength, and complex permittivity were measured to clarify mechanical and dielectric properties. Fourier transform infrared absorption and differential scanning calorimetric spectra were also measured to determine structural changes. As a result, it was found that FR-EPR becomes hard by oxidation and crosslinking, and that it becomes brittle as the degradation becomes more severe. In addition, such changes in mechanical properties by the aging occur much earlier than the changes in dielectric properties. Regarding this, IM is a good indicator to examine the degradation degree of FR-EPR.

本文言語English
ページ(範囲)488-495
ページ数8
ジャーナルIEEJ Transactions on Electrical and Electronic Engineering
15
4
DOI
出版ステータスPublished - 2020 4 1

ASJC Scopus subject areas

  • 電子工学および電気工学

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