【摘要】 为了研究聚合物绝缘材料表面陷阱参数对其绝缘性能的影响,在简述了等温电流衰减理论后依该理论设计了材料表面陷阱分布测量装置,并实际测量了聚合物低密度聚乙烯、聚丙烯和聚四氟乙烯的表面陷阱分布。在对材料直流充电后将其短路1min以清除表面沉积的自由电荷,再移去短路电极并将探头迅速移至材料表面充电区域记录表面电位。实验保持恒温条件,用等温电流衰减理论计算材料的陷阱分布参数。实验表明电子空穴陷阱与材料的分子结构密切相关,聚合物不同高分子链影响着陷阱电荷的分布。更多还原

【Abstract】 In order to investigate the relationship between the surface trap and insulation performance of polymers.The theory of isothermal currents proposed by J.G.Simmson etc in 70s last century was introduced in this paper and a set up of measurement device was designed to measure the trapping parameters of the surface layer of polymers.3 kinds of polymer material films were used.The needle-plane corona discharge was employed to charge the samples.The upper side of each sample was subjected to a dc corona discharge in atmosphere,and the other side was grounded.The applied voltage was ±4 kV and the charging time was set as 2 min.After charging,all needle electrodes were taken away,and the two sides of the sample were short-circuited for 1 minute to remove the free charges.Then the surface potential of samples was measured without contacting a surface potential meter(S2001A,Kawaguchi),and the surface trapping parameters could be calculated by the theory of isothermal currents.The electrons and holes traps shape of LDPE and PTFE was similar but not similar to PP.Results show that density of electrons and holes traps and energy distribution are related with the macromolecular chain structure,the different atom attached to the main chain affects the traps distribution heavily.更多还原