TY - JOUR
T1 - Degradation mechanisms of silicone rubber under different aging conditions
AU - Kaneko, Takuya
AU - Ito, Seitaro
AU - Minakawa, Takefumi
AU - Hirai, Naoshi
AU - Ohki, Yoshimichi
N1 - Funding Information:
This research was supported by the Nuclear Regulation Authority in Japan through Ageing Management Technical Evaluation Enhancement Program .
Publisher Copyright:
© 2019 Elsevier Ltd
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/10
Y1 - 2019/10
N2 - Various kinds of aging treatments were given to silicone rubber (SiR), an important inorganic polymer for electrical insulation. Then, the SiR sheets were examined by terahertz (THz) absorption spectroscopy, infrared absorption spectroscopy, nuclear magnetic resonance, and indenter modulus. As a result, it has become clear that three degradation mechanisms appear in SiR, depending on the aging condition. If SiR is aged thermally, the formation of cross-linked structures dominates. On the other hand, the oxidation of cyclic siloxane at the surface appears obviously if SiR is gamma irradiated at room temperature. In the case of steam exposure at 155 °C, SiR loses its molecular weight by hydrolysis. Corresponding with these aging processes, specific changes appear in THz absorption spectra. Regarding this, THz absorption spectroscopy is useable for condition-monitoring of SiR.
AB - Various kinds of aging treatments were given to silicone rubber (SiR), an important inorganic polymer for electrical insulation. Then, the SiR sheets were examined by terahertz (THz) absorption spectroscopy, infrared absorption spectroscopy, nuclear magnetic resonance, and indenter modulus. As a result, it has become clear that three degradation mechanisms appear in SiR, depending on the aging condition. If SiR is aged thermally, the formation of cross-linked structures dominates. On the other hand, the oxidation of cyclic siloxane at the surface appears obviously if SiR is gamma irradiated at room temperature. In the case of steam exposure at 155 °C, SiR loses its molecular weight by hydrolysis. Corresponding with these aging processes, specific changes appear in THz absorption spectra. Regarding this, THz absorption spectroscopy is useable for condition-monitoring of SiR.
KW - Aging
KW - Degradation
KW - Indenter modulus
KW - Inorganic polymer
KW - Non-destructive diagnosis
KW - Terahertz time-domain spectroscopy
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U2 - 10.1016/j.polymdegradstab.2019.108936
DO - 10.1016/j.polymdegradstab.2019.108936
M3 - Article
AN - SCOPUS:85070621821
SN - 0141-3910
VL - 168
JO - Polymer Degradation and Stability
JF - Polymer Degradation and Stability
M1 - 108936
ER -