Dielectric permittivity and breakdown characteristics of polymer-mica composites

Novel and economically promising polymer/mica composites have been produced by microwave-plasma irradiation of mica flakes in ethylene prior to incorporation into a polyethylene matrix. These materials have good melt flow properties, favorable filler alignment, and controlled interfacial characteristics. This has prompted us, firstly, to carry out “diagnostic” measurements of the interfacial polarization (Maxwell-Wagner effect) and, secondly, to evaluate these composites from the point of view of their possible interest in high voltage insulation technology.