STATIC AND DYNAMIC PYROELECTRIC COEFFICIENTS OF POLYVINYLIDENE FLUORIDE OVER A 90-370-K TEMPERATURE-RANGE

The static and the real and imaginary components of the dynamic pyroelectric coefficients were measured on a film of polyvinylidene fluoride (PVF2) over a 90-370 K temperature range. These are the first pyroelectric coefficients of PVF2 measured at extremely low temperatures, and the first complex dynamic pyroelectric coefficients reported in the literature. The static coefficient was small and constant below the glass transition temperature Tg, but increased very rapidly above T g. The real dynamic coefficient was in good qualitative agreement with the static value. The imaginary dynamic coefficient had a complicated frequency dependence which can be used to examine elastic and piezoelectric relaxation processes.