Effects of radiation crosslinking on electrical properties of tetrafluoroethylene-ethylene copolymer

We investigated the effects of fast electron irradiation on electrical properties of tetrafluoroethylene-ethylene copolymer (F40) and measured volume resistivity ρ_V, dielectric loss angle tgδ, permittivity ε_r and breakdown strength E_B, before and after irradiation. We found that ρ_V and tgδ seriously varied with radiation. ρ_V decreased by two orders of magnitude after irradiation, and slowly recovered with the storage time at room temperature. Howwhile, ε _r and E_B are unchanged. We think that the variation of ρ_V and tgδ are due to trapped carriers and space charge in irradiated F40. Studies on radiation crosslinking of F40 have been reported, but effects of fast electron irradiation on electric properties of F40 have not yet been reported. This paper gives our results for the variations in volume resistivity ρ_V, loss tangent tgδ, relative permittivity ε_r and dielectric breakdown strength E_B of F40 after fast electron irradiation, and the variations of irradiated F40 electrical properties with standing time at room temperature have been observed dynamically