纳米TiO_2掺杂对低密度聚乙烯空间电荷行为的影响

Influence of nano-TiO_2 doped low density polyethylene on space charge behavior

本文利用压力波法(PWP)研究了低密度聚乙烯(LDPE)以及掺杂0.5%(质量分数)TiO2的低密度聚乙烯在高电场下的空间电荷分布及其等温衰减特性,结合红外光谱(IR)、扫描电镜(SEM)和热刺激电流(TSC)谱研究了掺杂前后的微观形貌和陷阱能级的变化.结果表明,掺杂改变了电荷的注入和积累分布;其精细结构产生了较深的陷阱能级;这对聚乙烯高压电力电缆中电树枝的引发和生长的抑制有应用价值.

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.