压力膨化处理对正极性聚丙烯蜂窝膜的驻极体性质的影响  

Influence of pressure expanding treatment on electret properties of positively corona charged cellular PP films

作　　者：王飞鹏[1] 夏钟福[1] 裘晓敏[1] 吕航[1] 邱勋林[1] 沈军[1] 

机构地区：[1]同济大学波耳固体物理研究所,上海200092

出　　处：《物理学报》2005年第9期4400-4405,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50073016);中德驻极体合作课题(批准号:Ref.I77365)资助的课题.~~

摘　　要：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.Pressure expanding treatment is an effective method for improving the piezoelectric activity of cellular PP films. In this work, the character of trap-level distribution for positively corona charged cellular PP films and the influence of the pressure expanding treatment on its charge stability and charge transportation have been studied by means of thermal pulse technique, surface potential decay measurements, SEM and TSD spectrum analyses, etc. The results point out that there are three kinds of traps with different energy values in the range of middle energy level for the cellular PP films, i.e. most of the deep traps and the shallow traps in the bulk, and most of the traps with middle energy values near the free surface. The pressure expanding treatment changes the state of traps and also, to a certain extent, reduces the charge storage stability of the cellular PP films, but has not impact on its charge transportation rule, in which the slow retrapping effect is dominant.

关 键 词：压力膨化处理 聚丙烯蜂窝膜 驻极体 电荷储存与陷阱分布 电荷输运 膨化处理 聚丙烯 薄膜 蜂窝 压力 正极性 电荷稳定性 电荷储存稳定性 

分 类 号：O484[理学—固体物理]