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Role of electrostriction on the electrical aging of polymers

It is shown that the major parameters affecting most electrical properties of dielectrics, especially aging, are more poorly known than believed. This paper points out three major problems: the real values of the field-induced stress and strain, the strain saturation under high fields and the exact role of the sample size. One mechanism allowing to take those difficulties into account is electrostriction and although it is limited in low dielectric constant dielectrics, it appears to be significant in the cases studied here. The influence of sample size requires further work but it is already clear that many parameters involved in electrostriction are depending on sample thickness and possibly also on volume. Application to conduction and breakdown is briefly evoked.