Pyroelectricity and Charge Transport in a Copolymer of Vinylidene Fluoride and Tetrafluoroethylene.
NATIONAL BUREAU OF STANDARDS WASHINGTON DC POLYMERS DIV
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A copolymer of 73 weight percent vinylidene fluoride and 27 weight percent tetrafluoroethylene can be made piezoelectric and pyroelectric by the temporary application of high electric fields. The application of a thermal pulse technique to the active films reveals that they are polarized preferentially near the positive electrode and that the polarization extrudes further into the film as the poling temperature is increased. These observations can be made consistent with earlier data which show the piezoelectric and pyroelectric coefficient to be independent of poling temperature by proposing charge transfer through the unpoled region of the polymer. Transient charge flow following a step-increase in temperature and pyroelectric response from layered structures support this explanation.
- Electricity and Magnetism