Surface Potential Decay of Low Density Polyethylene (LDPE) Films under Different Corona Discharge Conditions

Abstract

The surface potential decay on low-density polyethylene (LDPE) has been studied after negative charge deposition by corona effect as a function of initial potential Vo and charging time tc. It was found that the decay rate increases with initial potential and charging time. For high charging level, cross over phenomenon has been observed. Surface potential profile has been recorded with two different charging levels. The surface potential profile indicates the absence of lateral migration of charges along the free surface of the LDPE film and the presence of the hollow for high initial potential, which makes the bulk conduction mechanisms caused by charge injection into the LDPE film bulk, responsible for the observed surface potential decay.