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

In this paper, the EP/SrTiO
₃
and EPIBaTiO
₃
nanocomposite were prepared by adopting SrTiO
₃
or BaTiO
₃
nanoparticles 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/SrTiO
₃
nanocomposite are higher than that of EP/BaTiO
₃
nanocomposite with the same mass fraction. Owing to uniform distribution of nanoparticles in the epoxy resin matrix, both EP/SrTiO
₃
and EP/BaTiO
₃
nanocomposite 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/SrTiO
₃
are slightly higher than that of EP/BaTiO
₃
. To draw a conclusion, filling SrTiO
₃
or BaTiO
₃
nanoparticles 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.