Particle size dependence on the AC and DC conductivity characteristics of barium titanate filled acrylic resin

It has previously been investigated that the addition of certain fillers into polymers can produce composite materials with enhanced electrical conductivity characteristics. It has also been previously demonstrated that addition of barium titanate into a polymer can produce a material with an electrical field dependent permittivity, whilst having a low DC conductivity. Such materials are useful for the purposes of electrical stress relief and grading in AC applications, as they have lower dielectric loss factors, than current stress controlling materials, whist still being able to redistribute electrical stresses in areas of high intensity. The system used in this investigation is an acrylic resin filled with various concentrations of barium titanate. This paper now studies how the barium titanate filler particle size affects the AC and DC conductivity characteristics of the composite system.