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The impulse electric strength of polythene film has been measured with and without a prestressing direct voltage of opposite polarity to that of the breakdown impulse after heating the polymer at several temperatures between 20 and 100 degrees C and quenching to room temperature. The steady-state electrical conduction through similar film specimens following identical heat treatment has also been measured. There was a correlation between breakdown strength with prestress, electrical conduction, and morphology as evinced by density changes.
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Cooper et al. (1977) studied this question.
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