For studying the aging characteristics of alicyclic epoxy resin in high temperature and high humid environment in the south of China

the humid and hot aging test on the sheath material of the alicyclic epoxy resin is performed in this paper. Then

the samples are taken out at different aging times and such test analysis as the tensile strength

elongation at break

bulk resistivity

water absorption

dielectric constant

dielectric loss angle tangent value

scanning electron microscope

thermal weight loss and the Fourier infrared spectroscopy are performed and compared with the silicone rubber insulator sheath material. The results show that both alicyclic epoxy resin and silicon rubber material are affected by the humid and hot environment with tensile strength

elongation at break and volume resistivity decreased

dielectric constant

dielectric loss angle tangent and saturated water absorption increased and the thermal decomposition temperature basically unchanged. The influence of humid and hot environment on the tensile strength of alicyclic epoxy resin is larger and the influence on the elongation at break of the silicone rubber is also larger. The main ester bond hydrolysis of the alicyclic epoxy resin is caused by the humid and hot aging

while the main chain of Si-O-Si of silicone rubber is broken.