Dielectric and Carrier Transport Properties of Silicone Rubber Degraded by Gamma Irradiation

被引:45
作者
Min, Daomin [1 ,2 ]
Yan, Chenyu [1 ]
Huang, Yin [1 ]
Li, Shengtao [1 ]
Ohki, Yoshimichi [1 ,2 ,3 ]
机构
[1] Xi An Jiao Tong Univ, State Key Lab Elect Insulat & Power Equipment, Xian 710049, Shaanxi, Peoples R China
[2] Waseda Univ, Res Inst Mat Sci & Technol, Shinjuku Ku, Tokyo 1698555, Japan
[3] Waseda Univ, Dept Elect Engn & Biosci, Shinjuku Ku, Tokyo 1698555, Japan
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
conductivity; dielectric property; gamma irradiation; SiR; trap distribution; OXIDATIVE-DEGRADATION; SEMICONDUCTORS; SPECTROSCOPY; POLARIZATION; INSULATORS; ABSORPTION; DISPERSION; CURRENTS; CHARGE;
D O I
10.3390/polym9100533
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Silicone rubber (SiR) is used as an insulating material for cables installed in a nuclear power plant. Gamma rays irradiated SiR sheets for various periods at temperatures of 145 and 185 degrees C, and the resultant changes were analyzed by examining complex permittivity spectra and surface potential decay characteristics. Three different processes, namely, instantaneous polarization, electrode polarization due to the accumulation of ions to form double charge layers at dielectric/electrode interfaces, and DC conduction caused by directional hopping of ions, contribute to the complex permittivity. By fitting the spectra to theoretical equations, we can obtain the dielectric constant at high frequencies, concentration and diffusion coefficient of ions and DC conductivity for the pristine and degraded samples. The instantaneous polarization becomes active with an increase of dose and ageing temperature. The thermal expansion coefficient estimated from the temperature dependence of dielectric constant at high frequencies becomes smaller with an increase in dose, which is in good agreement with the experimental results of the swelling ratio. Additionally, trap distributions are calculated from surface potential decay measurements and analyzed to explain the variation in conductivity. Trap energy increases firstly, and then decreases with an increase in dose, leading to a similar change in DC conductivity. It is concluded that generations of both oxidative products and mobile ions, as well as the occurrence of chain scission and crosslinking are simultaneously induced by gamma rays.
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页数:15
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