Abstract
Polyetherimide is a versatile polymer with interesting thermal properties (Tg above 200°C) that is already used in electrical engineering. It is of interest to investigate its electrical charge storage and decay processes, both to predict the degradation occurring under electrical load, but also for the purpose of using it in electret devices. The difference between two similar grades of Ultem PEI films, which have different charge decay processes, was studied. The more recently introduced grade, Ultem 5000, displays a charge decay which can be attributed to carrier drift. Ultem 1000 shows a slower decay process. Some microstructural effects, particularly related to the surface and its water absorption, may account for this important difference between two very similar polymers. © 1998 SCI.
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