微孔结构交联聚丙烯驻极体的储电性研究  

Charge storage capability of cross-linked polypropylene electret films

作　　者：王学文[1] 潘道胜[1] 张晓青[1] 曹功勋[1] 张硕[1] 夏钟福[1] 李宏强[1] 温云飞 

机构地区：[1]同济大学波耳固体物理研究所,上海200092 [2]中国石油化工与销售西南分公司,四川成都610015

出　　处：《功能材料》2009年第4期574-577,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50503018);上海市青年科技启明星计划资助项目(07QA14056)

摘　　要：压电驻极体是以双极性空间电荷驻极体为基体的新一类人工微结构压电功能材料,其压电性能与基体材料的储电性有直接关系。采用等温表面电位衰减测量和开路热刺激放电实验方法,研究了经热压处理的交联聚丙烯(XPP)膜中电荷储存稳定性和电荷动态特性。结果表明,XPP中正电荷的储存稳定性强于负电荷;在老化温度低于90℃时,经过5120min时间老化,正电晕充电样品的表面电位仍然能够维持在初始表面电位的90%以上,而负电晕充电样品却低于86%;热激发脱阱的负空间电荷在驻极体内电场的作用下迁移的过程中大部分被更深的能阱捕获,即脱阱电荷的输运规律受快再捕获效应控制。Piezoeleetrets, based on the bipolarity space-charge electret, become a new class of artificial piezoelectric functional materials. Their piezoelectric performances have a directly relationship with the charge storage capability of the material. In this paper, the charge storage stability and motion in the hot-pressed cross-linked polypropylene （XPP） electret films are investigated, by using the measurements of isothermal surface potential decay and open thermally stimulated discharge spectra. The results show that the storage stability of the positive charge in the XPP films excess that of the negative. When the pre-age temperatures are below 90℃, the surface potential of positive-charged sample, still keeps above 90% of the initial value after 5120min annealing, while the value for the negative-charged sample is below 86 %. The thermally stimulated discharged negative charges drift along the internal electric field. Most of them are retrapped in deeper traps, meaning the motion of the detrapped charge is controlled by the fast retrapping effect.

关 键 词：XPP膜 电荷储存稳定性 电荷动态特性 

分 类 号：O484.4[理学—固体物理]