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Polymers, especially insulating polymers, are utilized in almost all technological fields. At the present time it is probably extremly difficult to purchase a measuring instrument or even a household tool which does not incorporate any kind of plastic, insulating material. With this growing use the knowledge of the physical properties, in general, and the here discussed electrical properties, in particular,...
Sandwich structures consisting of porous PTFE films clamped between two FEP Teflon films show large quasi- static piezoelectric coefficients due to high residual polarization formed by breakdown charges trapped at the interfaces between the two dielectrics. At the same time, the stability of polarization and the piezocoefficient is limited by rather high mobility of positive charges in FEP films....
The results presented in this paper reveal a number of interesting features of the poling of PVDF: Room-temperature poling yields, depending on the applied field, no polarization at all or a spatially uniform polarization. In contrast, poling at elevated temperatures yields generally a nonuniform polarization with the poled region located close to the positive electrode at low fields, but extending...
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