Piezo- and Pyroelectricity of Poly(Vinylidene Fluoride) from Plasma Poling.
NATIONAL BUREAU OF STANDARDS WASHINGTON D C
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A plasma poling device is described which allows essentially instantaneous poling of polymeric films at room temperature at very high fields. Using polyvinylidene fluoride both undrawn comprising essentially pure alpha conformation and biaxially drawn both alpha and beta conformation were polarized in this manner. The polarization of the sample was determined from current integration measurements. The piezoelectric and pyroelectric coefficients were then measured and compared with those estimated from the polarization theory of Mopsik and Broadhurst, which expresses these coefficients as linear functions of polarization. The theory gives an accurate representation of the piezoelectric coefficients, but underestimates the pyroelectric coefficients considerably.
- Plasma Physics and Magnetohydrodynamics