High Dielectric Inorganic / Organic Composite Materials

By integrating two or more materials with complementary properties, newcomposite materials offer the potential to have performance far beyond those of theconstituent materials. There is currently great interest in the technological propertiesof particle-filled polymers, because it is primarily a very efficient in the function andcost-effective process for mass production. For example, the flexibility compositeswith a high dielectric constant have a great future in the electronic industry field. Thecomposites may be used to prepare a shape-bend mutilayer chip capacitors. Therefore,it is very significant for improving the dielectric constant of the composites.The dielectric properties of the composites were studied, which composites weremade of polymer matrix, such as PVDF and LDPE, and inorganic fillers with adifferent shapes and properties. LTNO and LNO fillers were prepared using a sol-gelmethod and other process. Nanoscale ZnO was also prepared by means of aco-precipitation. The dielectric behaviors of the composites with these fillers werestudied. The results show that the composites studied have a high dielectric constant.However, the dielectric constant and the percolation threshold of the composites aredifferent due to the effect of the conductors and semiconductors with differentproperties. The new composites studied here with high dielectric constant may befabricated the mutilayer chip capacitors. The conductivity, shape and microstructureof the fillers have an important effect on the dielectric constant of the composites. Thedielectric constants are very high in three phase composites, which are a (conductor+BT) and PVDF. The high dielectric constant can be explained by means of themixture and percolation effect theories. The composites with an excellent propertycan be tailored by choosing a suitable polymer matrix, inorganic fillers, mixtureprocessing and some important parameters in production.