TY - JOUR
T1 - Degradation of Mechanical and Dielectric Properties of Flame-Retardant Ethylene Propylene Rubber by Thermal Aging
AU - Yamaguchi, Hikaru
AU - Ishii, Hiroyuki
AU - Hirai, Naoshi
AU - Ohki, Yoshimichi
N1 - Funding Information:
This research was performed under the research entrusted by Secretariat of Nuclear Regulation Authority in Japan. We thank M. Hanada and T. Kaneko for their help.
Publisher Copyright:
© 2020 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
PY - 2020/4/1
Y1 - 2020/4/1
N2 - 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.
AB - 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.
KW - Fourier transform infrared absorption spectroscopy
KW - complex permittivity
KW - degradation
KW - differential scanning calorimetry
KW - indenter modulus
KW - polymer
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U2 - 10.1002/tee.23079
DO - 10.1002/tee.23079
M3 - Article
AN - SCOPUS:85078250264
VL - 15
SP - 488
EP - 495
JO - IEEJ Transactions on Electrical and Electronic Engineering
JF - IEEJ Transactions on Electrical and Electronic Engineering
SN - 1931-4973
IS - 4
ER -