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The piezoelectrets made of porous polytetrafluoroethylene (PTFE) and nonporous fluoroethylenepropylene (FEP) layers are prepared by using a hot-pressing method. The dependence of the quasi-static piezoelectric d33-coefficients of such films on the grid voltage during the corona charging is investigated. The thermal stability of d33-coefficients for the films is characterized by the isothermal method...
Some study results point out that the shift path of detrapped charges in cellular polymer due to the electret field is along the solid dielectric layer near the boundary of the cavities from the detrapping position (Behrendt, 2006). In this paper, the influence of formation of macroscopy dipoles and their density on dielectric properties, charge storage and shift behaviour of detrapped charges was...
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