用恒流电晕充电改善氟聚合物驻极体的电荷贮存能力

Improved Charge Storage Capability for Nonpolarity Fluoropolymer by means of Constant Current Corona Charging

本文从对固体介质的电晕充电的电流方程出发,研究了恒流和常压电晕充电的非极性氟聚合物(如Teflon FEP,Teflon PFA和Teflon PTFE等)的电荷建立过程,阐明了恒流电晕充电可使样品注入较大浓度的体电荷,通过恒流和常压电晕充电后的Teflon PFA驻极的等效表面电位衰减曲线和开路TSD电流谱线的比较,说明了恒流电晕充电能明显地改善这类材料电荷贮存的稳定性。在研究了这类材料各类能阱沿厚度方向的几何分布和比较恒流和常压电晕充电Teflon PFA薄膜的电荷重心随充电温度的迁移规律后,揭示了利用恒流电晕充电能有效地改善这类材料注入电荷存贮稳定性的结构根源。

In this paper, charge build-up for nonpolarity fluoropolymer (such as Teflon FEP, Teflon PFA and Teflon PTFE, etc.) by means of constant voltage and constant current corona charging is studied and we have come to the conclusion that more charge density is injected in the bulk by using constant current corona charging. After comparing isothermal surface potential decays and open-circuit TSD current spectra wilh constant voltage and constant current charging conditions on Teflon PFA, it is noticed that the charge storage stability can be improved significantly by means of constant current corona charging. After studying the geometric distributions of traps with different energies in the Teflon PFA films and comparing different shifts of mean charge depth between constant current and constant voltage corona charged Teflon PFA at the elevated temperature, we found the improvement of charge storage stability by constant current corona charged nonpolarity fluoropolymer is due to the structure feature of the material.