TY - GEN
T1 - Degradation of Flame-retardant Cross-linked Polyolefin in Simulated Severe Environments
AU - Hirai, Naoshi
AU - Zhou, Haolong
AU - Ohki, Yoshimichi
N1 - Publisher Copyright:
© 2020 IEEE.
PY - 2020/10/18
Y1 - 2020/10/18
N2 - It is important to know how the degradation proceeds in a polymer used for electrical insulation in power apparatus, especially in severe environments. Sheets of flame-retardant crosslinked polyolefin (FR-XLPO) were aged thermally at 100, 135, and 155 °C with or without simultaneous irradiation of 60Co gamma rays. They were then analyzed experimentally. The samples aged purely thermally at 135 and 155 °C show more obvious changes in mechanical and dielectric properties than the other samples. While the elongation-at-break (EAB) first increases and then decreases drastically in a relatively early stage of aging, the indenter modulus (IM) shows almost no changes. After that, in a later stage of aging, EAB has no room to go down, whereas IM goes up to high values. It seems that the radiation-induced formation of cross-linked structures makes the polymer harder, which mitigates the progress of damages induced by the aging. Consequently, EAB can be a suitable indicator of the aging of FR-XLPO in a relatively early stage, while IM can be an indicator usable in a later stage.
AB - It is important to know how the degradation proceeds in a polymer used for electrical insulation in power apparatus, especially in severe environments. Sheets of flame-retardant crosslinked polyolefin (FR-XLPO) were aged thermally at 100, 135, and 155 °C with or without simultaneous irradiation of 60Co gamma rays. They were then analyzed experimentally. The samples aged purely thermally at 135 and 155 °C show more obvious changes in mechanical and dielectric properties than the other samples. While the elongation-at-break (EAB) first increases and then decreases drastically in a relatively early stage of aging, the indenter modulus (IM) shows almost no changes. After that, in a later stage of aging, EAB has no room to go down, whereas IM goes up to high values. It seems that the radiation-induced formation of cross-linked structures makes the polymer harder, which mitigates the progress of damages induced by the aging. Consequently, EAB can be a suitable indicator of the aging of FR-XLPO in a relatively early stage, while IM can be an indicator usable in a later stage.
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U2 - 10.1109/CEIDP49254.2020.9437472
DO - 10.1109/CEIDP49254.2020.9437472
M3 - Conference contribution
AN - SCOPUS:85107219636
T3 - Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
SP - 487
EP - 490
BT - CEIDP 2020 - 2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2020
Y2 - 18 October 2020 through 30 October 2020
ER -