聚酰亚胺薄膜的高场电导特性

研究了Dupont原始及耐电晕聚酰亚胺薄膜在10kV／mm、20kV／mm电场下电晕老化8h前后和在不同温度下的高场电导特性．结果表明，原始及耐电晕聚酰亚胺薄膜老化前的电老化阈值分别为35kV／mm和45kV／mm，并随着老化电场的增加而下降．随着温度的升高，原始聚酰亚胺薄膜的电老化阈值明显增加，而耐电晕薄膜的电老化阈值略有下降．耐电晕薄膜的电导电流比原始薄膜约大一个数量级．根据空间电荷限制电流与温度的关系，求出原始和耐电晕聚酰亚胺薄膜的陷阱能级分别为0．9eV和0．7eV．

High-field conduction current characteristics of polyimide film

The field dependent conduction current of both Dupont original and corona-resistant polyimide films before and after corona-aged 8 hours at 10 kV/mm and 20 kV/mm electric field, and at different temperatures was measured respectively. The results show that the electrical degradation threshold of original and corona-resistance polyimide film is 35 kV/mm and 45 kV/mm, and decreases with the increasing of aging electric field. With the increase of temperature, the electric degradation threshold of original film increases and of the corona-resistant film decreases. The conduction current of corona-resistant polyimide film is larger by about one order of magnitude than that of original one. The trap energy level of 0.geV and 0.7eV was derived from Arrehnius plot respectively.