DIELECTRIC PROPERTY OF BaTiO₃/PVDF COMPOSITE PREPARED BY A MELT PROCESS

The polyvinylidene fluoride (PVDF) with barium titanate (BaTiO₃) was prepared in melt as a dielectric composite. BaTiO₃ was modified by titanate coupling agent and Ti(OBu)₄ coupling agent. The dielectric properties and the interfacial interaction of the composite were examined. It is found that the dielectric constant can reach the highest value when the BaTiO₃ particle is modified by coupling agent contents of 60% and the dielectric loss has a max value when the BaTiO₃ particle is modified by coupling agent of about 30%. The SEM micrographs of BaTiO 3/PVDF show that the interfacial interaction between PVDF and BaTiO₃, the weight fraction of BaTiO₃ and the size of modified BaTiO₃ are the keys to the dielectric properties of BaTiO₃/PVDF dielectric composite.