Two kinds of decay time constants for interfacial space charge in polyethylene-laminated dielectrics

Two kinds of charge decay time constants were experimentally found for interfacial space charge induced by voltage application in an interface between polyethylene and each of other polymers such as EVA, EPR and EPDM. These are named as short time constants and long time constants. The short decay time constants are dependent on the counter dielectric materials, while the long decay time constants are almost independent of the kind of the counter dielectrics and their electrical resistivity. Processes of charge accumulation and decay in the interfaces are discussed.