Abstract

Experimental measurements of charge transient current in polyimide (Kapton) films at fields between 24 and 64 MV/m and temperatures ranging from 100/spl deg/C to 180/spl deg/C, have shown an anomalous behavior at high temperatures. Many mechanisms have been proposed with a view to explain results; dipolar polarization, homocharge injection, interfacial polarization etc. as well as a combination of these. An empirical formula, taking into account these different mechanisms, gives a good agreement with experimental results.

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