The negative heterocharge generation mechanism in polymeric dielectrics

Charge profiles in LDPE containing both DCP and sulfur-containing antioxidants, which were heat-pressed under different temperatures, were examined to study the heterocharge generation mechanism in polymeric dielectrics. Negative hetero-charges near the positive electrode were detected in samples containing both DCP and the antioxidants when those samples were soaked in acetophenone. The negative heterocharges were not detected in samples containing either DCP or the antioxidant, even when the sample was soaked in acetophenone. These results demonstrate that the heterocharge is generated by the combined effect between acetophenone and substance produced by interaction between DCP and a sulfur-containing antioxidant Considering results of experiments measuring the amount of heterocharges in samples that had been heat-pressed at different temperatures, the mechanism of negative heterocharge generation in polymeric dielectric material is inferred.