Degradation in Dielectric Behavior of Soft Epoxy Resin by Concurrent Aging with Heat and Radiation

摘要

The soft epoxy resin (SE) and the hard epoxy resin (HE) used in the nuclear power plants were simultaneously given heat and radiation. The glass transition temperature (Tg), indenter modulus (IM), and complex permittivity were measured. The difference in Tg between SE and HE is very significant, which exerts a great deal of influence on the degradation of SE and HE. While the IM and complex permittivity of HE are hardly affected by the degradation, SE becomes hard and its charge transport becomes less active.