逾渗复合体系的结晶度对逾渗阈值和介电行为的影响  

Effect of the Matrix Crystallinity on the Percolation Threshold and Dielectric Behavior in Percolative Composites

作　　者：冯军强[1] 代大庆[1] 郑廷秀[1] 陈建军[1] 李荣先[1] 

机构地区：[1]深圳清华大学研究院纳米材料应用研究室,广东深圳518057

出　　处：《中国材料进展》2009年第2期43-47,共5页Materials China

基　　金：国家自然科学基金资助项目(50277029)

摘　　要：通过制备不同结晶度的聚乙烯(PE)基体,研究基体结晶度对逾渗复合体系的逾渗阈值和介电行为的影响。结果显示逾渗阈值与基体的结晶度呈反比关系,而介电常数的增加与基体结晶度呈正比。提出用二维图表反映这种关系。此外,还发现绝缘体-导体的转变在以低结晶度为基体的复合材料中更易出现,这可能对制备具有高介电常数、低损耗的逾渗复合材料有利。Through the use of polyethylenes with different erystallinities as matrices, the effects of the matrix crystallinity on the percolation threshold and dielectric behavior of percolative composites have been investigated. The results suggest that the percolation threshold is negatively related to the matrix crystallinity, whereas the enhancement of the dielectric constant is positively related to the matrix crystallinity. A two-dimensional diagram is proposed to illustrate such relationships. In addition, it has been found that the insulator-conductor transition is much flatter in low - erystallinity - matrix -based composites, and this may be favorable for preparing threshold composites with a high dielectric constant and a low loss tangent.

关 键 词：共混 复合材料 导电聚合物 介电特性 基体 

分 类 号：TB333[一般工业技术—材料科学与工程]