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压力膨化处理工艺能够显著改善聚丙烯蜂窝薄膜(cellularpolypropylene)驻极体的压电活性。通过热脉冲技术、表面电位衰减测量及TSD电流谱分析等研究了经恒压正电晕充电的聚丙烯蜂窝膜的陷阱能级分布特征,讨论了压力膨化处理工艺对这类蜂窝膜驻极体电荷稳定性及电荷输运特性的影响.结果说明,PP蜂窝膜内存在着位于中能级区的能值各异的三种分立陷阱,深能值陷阱和浅能值陷阱的大多数位于孔洞膜近表面的体层或体内,而中等能值陷阱则主要位于自由面附近.压力膨化处理改变了PP蜂窝膜的能阱状态并在一定程度上降低了这类孔洞膜驻极体的电荷储存稳定性,但没有明显影响其由慢再俘获效应占主导地位的脱阱电荷输运特性.
The pressure-puffing process can significantly improve the piezoelectric activity of the polypropylenepolyethylene electret. The characteristics of trap level distribution of polypropylene honeycomb membrane charged by constant voltage positive corona were studied by means of thermal pulse technique, surface potential attenuation measurement and TSD current spectrum analysis. The effects of pressure puffing treatment on the honeycomb membrane electret Charge stability and charge transport properties.The results show that there are three kinds of discrete traps in PP honeycomb membrane with different energy values in the mid-level region, and most of the deep energy traps and shallow traps are located in the holes While the mid-value trap is mainly located near the free surface.The pressure puffing treatment changed the state of energy well of PP honeycomb membrane and reduced the charge storage of such hole membrane electret to a certain extent Stability, but did not significantly affect its de-well charge-transport characteristics dominated by the slow re-capture effect.