利用常温下恒流和恒压电晕充电、充电后的等温表面电位衰减、热刺激放电和扫描电镜等实验手段研究了恒流和恒压电晕充电技术对聚四氟乙烯多孔薄膜驻极体驻极态的影响 .与恒压电晕充电相比较 ,恒流电晕充电时由于流过薄膜的电流恒定 ,增加了注入电荷在多孔结构厚度方向界面处的俘获概率 ,使沉积电荷密度上升 ,改善了驻极体的储电能力 .然而 ,这些位于不同层深多孔界面处的俘获电荷在这类功能膜储存或使用过程中 ,经外激发从脱阱位置以跳动 (hopping)模式输运至背电极的路径相对缩短将导致脱阱电荷衰减较快 Constant current and constant voltage at room temperature corona charging, isotherm surface potential reduction after charging, thermal stimulation discharge and scanning electron microscopy and other experimental means of constant current and constant voltage corona charging technology of porous PTFE membrane electret Compared with the constant voltage corona charging, the constant current flowing through the thin film during constant current corona charging increases the capture probability of the injected charge at the interface of the porous structure in the thickness direction, so that the deposition charge density increases, However, these trapped charges located at different depths of the porous interface are transported by the extrinsic excitation from the trap locations in hopping mode during the storage or use of such functional films The relatively short back electrode path will result in faster decay charge decay