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Natural electret behavior of polymers detected by Spontaneous Electrical Current (SEC) measurements

When a polymer sample is heated up at a constant heating rate in a capacitor arrangement (Fig. 1), a potential difference (SEP = Spontaneous Electrical Potential) or a SEC (Spontaneous Electrical Current) can be measured with no bias voltage being applied and with no prepolarization of the sample. We investigated several polymers and found this effect in every case. In comparison to TSD - (Thermally Stimulated Discharge) measurements in the most cases we found more and reproducible peaks in the SEC measurements, but at a much lower level. It should be mentioned that the polarity of the current peaks in SEC measurements is not reproducible.