Ferroelectric Hysteresis Effects in Poly (Vinylidene Fluoride) Films.
RUTGERS - THE STATE UNIV PISCATAWAY NJ HIGH PRESSURE MATERIALS RESEARCH LAB
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Investigations of the piezoelectric response of biaxially oriented poly vinylidene fluoride films subjected to a series of static positive and negative poling fields produces a hysteresis curve for d31 and e31 showing the ferroelectric character of phase IV. Examination of changes in the crystalline regions, using differential scanning calorimetry and x-ray methods, of films cycled statically through large positive and negative poling fields, provides insight into the switching mechanisms of both phase I and phase IV. The experimental results show a cyclic broadening and narrowing of the endothermic melting peaks as the film polarization is switched. Cyclic changes in the intensities of the phase I 110 200 and phase II or phase IV 100, 020, and 110 reflections are also observed. Author
- Physical Chemistry
- Electricity and Magnetism