Influence of nano-TiO2 doped low density polyethylene on space charge behavior
纳米TiO2掺杂对低密度聚乙烯空间电荷行为的影响

The space charge evolution and the isothermal decay for low density polyethylene (LDPE) with/without 0.5%(mass fraction) nano-TiO2 doping were investigated by using of the pulsed wave propagation (PWP) method. With infrared (IR) absorption, scanning electronic microscopy (SEM) and thermally stimulated current (TSC), we also discussed the morphology and the trap levels of the nano-TiO2 doped LDPE in this paper. The results indicate that the doping of nano-TiO2 has changed the injection and accumulation of space charge, the fine microstructure has made the trap levels deepened, which may prevent the inducement and the development of the electric trees in high-voltage cables of polyethylene.