Stability measurements on liquid charged Teflon FEP electrets are reported. The initial decay is nonexponential and strongly dependent on experimental conditions, while the long-term decay is dependent on foil material and temperature. However, in all cases, there appears to be a single rate-limiting process with a measured activation energy equal to 1.9 ± 0.1 eV.
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Chudleigh et al. (1973) studied this question.