影响低密度聚乙烯/氧化锌复合材料场致电导因素的研究

An experimental investigation on the influence factors of the electric field-dependant conductivity of LDPE/ZnO composites

氧化锌(ZnO)是一种电导率具有场强依赖性的半导体材料,由其经烧结而制备的非线性电阻器件在稳压、过压保护、防雷、灭弧、消噪、补偿、消磁等方面得到了广泛的应用。以低密度聚乙烯(LDPE)和氧化锌粉末共混复合体系为研究对象,实验研究了影响LDPE/ZnO复合材料场致电导的主要因素。研究结果表明,增加ZnO的掺量、升高温度和减小压力均能提高LDPE/ZnO复合材料的非线性程度;对于按不同生产工艺制备的ZnO,其晶粒生长行为的不同导致晶粒结构的差异,从而使得含有不同制备工艺的ZnO的LDPE/ZnO复合材料的电导特性存在较大差别。

Zinc oxide （ZnO） is a typical semi-conductive material with field dependent conductivity,the non-linear resistance elements made of ZnO through sintering are widely used in electrical and electronic engineering for voltage stabilizing, overvoltage protection , lightning protection, arc exterminating, noise eliminating , compensation,magnetism eliminating etc. This study take the low density polyethylene（LDPE）/zinc oxide composite as the research object ,and investigate the main influence factors of electric field-dependant conductivity of the composite experimentally. The experimental results show that the nonlinear degree of the conductivity of composites increased with increment of the filling content of ZnO and environmental temperature, also increased with decre- ment of pressure. At the same times,it is shown through experiments that the nonlinear degrees of composites filled with different zinc oxides prepared from different processes, because of the different zinc oxides prepared from different processes have the different crystal structures and surface micro-shapes.