Evaluation of internal electric field by separation method

The author describes the separation method for evaluating the internal field of insulating composites under any conditions. This method is shown to be useful for analyzing a composite if it contains a dipole. Using this method, experiments were performed on PE (polyethylene) and EVA (ethylene-vinyl acetate copolymer) composite. At 253 K the ratio of internal field of PE to EVA in the EVA-PE composite was estimated at about two for about EVA(+)-PE(-) and EVA(-)-PE(+). At 343 K, it was estimated at about three for EVA(-)-PE(+) and higher for EVA(+)-PE(-). It is demonstrated that this method is not only useful for internal field analysis but also makes it possible to identify the space-charge location inside the composite