2018 | OriginalPaper | Buchkapitel
Degradation of Silicone Rubber Analyzed by Instrumental Analyses and Dielectric Spectroscopy
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Silicone rubber (SiR)SiR was gamma irradiated at 125, 145 and 185 °C or thermally aged at 220, 250 and 280 °C and the resultant changes in performance were evaluated. It has become clear from instrumental analyses that crosslinking via oxidation of silicon atoms and chain scission are induced by gamma raysGamma rays. Furthermore, from the temperature dependence of real relative permittivity at high frequencies, the thermal expansion coefficient was found to become smaller with the increase in dose. These results can be understood well by the chemical and structural changes in SiR induced by the degradationDegradation.