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Photo-Stimulated Detrapping Currents (PSDCs) of FEP-teflon electrets charged by corona at 150°C were observed to understand the charge storage mechanism. Monochromatic light of a deuterium lamp (4–6.5 eV) or a mercury lamp (4.9 eV) was irradiated to the sample electrets at a room temperature. A threshold energy of light to generate PSDCs was found to be 4.9 eV. The experimental results indicate that...
When an electric field is applied to an insulating material three basic processes can take place: the dipoles tend to rotate, ions migrate and space charge can be injected at the interfaces, depending on such parameters as temperature or applied electric field. For many years, a direct analysis was impossible since the experimentally observable variables gave only an average of what was taking place...
All of the cured (cross-linked) polymers we studied have a pair of electret transition peaks separated by 20 to 60° C. The lower temperature current peak is clearly due to the glass-rubber transition in each case and the upper peak has always behaved as a so called “ρ-transition.” The latter is said to be associated with charge drift that is limited by space charge, diffusion of excess charges, ohmic...
In 1960 Gubkin1 published an electrostatic theory of piezoelectricity which did not involve the microscopic structure of the electret. This approach would seem to be a good description of the phenomenon of piezoelectricity in polymer materials, many of which are partially or completely amorphous. We applied Gubkin's model to a specific set of experimental conditions, which resulted in some simplifications...
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