TiO_(2)形状对TiO_(2)/PVDF复合材料介电性能影响的建模与仿真研究

Using Modeling and Simulation to Study the Influence of TiO_(2) Shape on the Dielectric Properties of TiO2/PVDF Composite

TiO_(2)/PVDF复合材料具有优异的高介电性能,在高电压和储能绝缘领域有着广泛应用前景。采用有限元法对TiO_(2)/PVDF复合材料体系的结构和性能进行模拟与仿真研究,通过建立二维和三维两种模型,从电场强度、漏电流密度、体系能量密度分布角度系统地研究复合材料的击穿机理,研究TiO_(2)形状对复合材料介电性能的影响。研究结果表明,掺杂5vol%TiO_(2)组分,相比于球形TiO_(2)/PVDF复合材料,线形TiO_(2)/PVDF复合材料的电场强度、漏电流密度、体系能量密度分布较为均匀,畸变较小,高电场强度、漏电流密度和能量密度区域明显减少,材料表面最高电场强度、漏电流密度、能量密度分别降低了1.42倍、1.41倍、2.01倍,材料内部平均电场强度、漏电流密度、能量密度分别降低了1.25倍、1.19倍、1.52倍。仿真结果表明线形TiO_(2)/PVDF复合材料有着更强的耐击穿能力,为制备高介电性能新材料提供理论依据。

TiO_(2)/PVDF composite materials have excellent high dielectric properties and have wide application prospects in the fields of high voltage and energy storage insulation.In this paper,the finite element method was used to simulate the structure and performance of TiO_(2)/PVDF composite material system.By establishing two dimensional and three dimensional models,the breakdown mechanism of composite material was systematically studied from the perspectives of electric field intensity,leakage current density,and system energy density distribution,studying the influence of TiO_(2) shape on the dielectric performance of composite material.The results of the research show that doping 5 vol%TiO_(2) components,compared to the spherical TiO_(2)/PVDF composites,the linear TiO_(2)/PVDF composites system of electric field intensity,the leakage current density and energy density distribution is relatively uniform,the distortion of the three physical quantities is small,high electric field intensity,leakage current density and energy density area decreased significantly.On the surface of the composite,the highest electric field strength,leakage current density and energy density are reduced 1.42 times,1.41 times,2.01 times.From the inside of the composite,the average electric field strength,leakage current density and energy density are reduced respectively 1.25 times,1.19 times,and 1.52 times.The simulation results show that linear TiO_(2)/PVDF composite has stronger breakdown resistance.This research can provide a theoretical basis for the preparation of new materials with high dielectric properties.