Comparative study on thermal and electrical properties of EP/SrTiO3and EP/BaTiO3nanocomposites

In this paper, the EP/SrTiO3and EPIBaTiO3nanocomposite were prepared by adopting SrTiO3or BaTiO3nanoparticles as fillers respectively. Thermal conductivity, dielectric spectrum, breakdown strength and flashover characteristics of the composites were investigated. The results reveal thermal conductivity and dielectric constant of EP/SrTiO3nanocomposite are higher than that of EP/BaTiO3nanocomposite with the same mass fraction. Owing to uniform distribution of nanoparticles in the epoxy resin matrix, both EP/SrTiO3and EP/BaTiO3nanocomposite have an improved breakdown field strength which increase with the mass fraction of filler. Moreover, incorporation of nanoparticles can help repair the potential defects inside the epoxy resin, creating a denser and smoother structure. Flashover experiment on the surface of sample under the microsecond pulse voltage proves that the flashover voltages of the nanocomposite are higher than that of the pure epoxy resin. Flashover voltages of EP/SrTiO3are slightly higher than that of EP/BaTiO3. To draw a conclusion, filling SrTiO3or BaTiO3nanoparticles can improve the thermal conductivity and insulating property of epoxy resin, especially the flashover voltage increases significantly. The novel composite would lay a foundation for the development of energy storage material and multifunctional dielectric material.