低密度聚乙烯热压成型过程中的空间电荷  

Space charges formed in the hot compression molding process of low density polyethylene

作　　者：安振连[1] 杨强[1] 郑飞虎[1] 张冶文[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》2007年第9期5502-5507,共6页Acta Physica Sinica

基　　金：国家自然科学基金重点项目(批准号:50537040)资助的课题.~~

摘　　要：借助开路热刺激放电(TSD)电流及原位实时电荷TSD和电荷等温衰减测量,研究了低密度聚乙烯(LDPE)在热压成型过程中所产生的空间电荷特性.结果表明具有良好室温稳定性的成型电荷被束缚在两类陷阱能级中:浅阱和深阱,其陷阱中心深度分别约为0.92eV和1.31eV.初步的分析进一步表明了它们应该分别位于试样的表层和体内,为近表面陷阱和体陷阱.The properties of space charges formed in the hot compression molding process of low density polyethylene （LDPE） have been studied by measuring the open-circuit thermally stimulated discharge （TSD） current, in situ TSD charge and the isothermal charge decay. The results showed that the space charges with high stability at room temperature （RT） are trapped in two kinds of traps： shallow traps and deep traps with central depths of about 0.92？eV and 1.31？eV, respectively. Preliminary analysis indicates that the shallow traps and deep traps should be located in the surface layer and in the bulk of the sample, forming surface traps and bulk traps,respectively.

关 键 词：低密度聚乙烯(LDPE) 热压成型 空间电荷 热刺激放电(TSD) 

分 类 号：O482.4[理学—固体物理]