Electret Properties of Layered Structures Based on Low Density Polyethylene Films

Electret charge storage and transport have been studied in layered low-density polyethylene structures by means of thermally surface potential decay and recovery. It has been found that during charge decay in layered polyethylene structures, the homocharge is transported through the polymer layers with retrapping in the deep traps located at the inner interface. Double- or multilayer film structures can be an interesting tool to study processes of charge storage and transport in polymers. Especially the role of interfaces can be in this way highlighted and studied in a controlled manner.