Abstract
We investigated the space charge behavior near the interface between different low-density polyethylenes (LDPE). Charge carriers were mainly injected from the semiconductive (SC) electrode in a specimen of AI/LDPE/LDPE/SC and they moved through the interface towards the counter AI electrode. Charge carriers moving from a lower density LDPE to a higher density one were accumulated near the LDPE/LDPE interface to form space charge, while there was no space charge accumulation at the interface caused by carriers moving in the opposite direction. The mobilities of charge carriers were estimated from the change in space charge profile with time. Charge carriers were more mobile in the lower density LDPE than in the higher density one. Positive carriers were more mobile than negative ones in each LDPE. The interface between different LDPE’s greatly affected space charge behavior and discharging currents.
