Thermally stimulated discharge of electron-beam-and corona-charged polypropylene films

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Abstract
Studies of short-circuit and open-circuit thermally stimulated discharge currents (TSDC) for electron-beam- and corona-charged polypropylene (PP) samples are reported. The experimental results indicate that open-circuit TSDC peaks at about 70 degrees C and 100 degrees C are caused by the detrapping of charges from surface and bulk traps respectively, while the origin of a peak at 150 degrees C is presently not clear. The short-circuit TSDC shows the existence of a positive-current peak between two negative peaks when the sample has been irradiated with a large dose. This current-reversal phenomenon verifies the fact that the charge layer in electron-beam-charged PP broadens towards the rear electrode when the injected charge density is increasing. A qualitative model to describe the charge dynamics of PP is suggested.