Ferroelectric behavior of polyvinylidene fluoride

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Abstract
The hysteresis loops between the electric displacement and the triangular applied electric field with an amplitude up to 300 MV/m and a period of 1000 sec were observed at -5°C and -80°C for stretched films of PVDF with form I crystalline phase. The ir dichroic absorption at the stretching vibration modes of CF2 and the linear dielectric constant showed also hysteresis loops against the electric field. By substracting the linear electric displacement from the observed electric displacement the hysteretic polarization in crystals was obtained, which was directly related to the dipolar rotation derived from the ir absorption measurements. It was also shown that the thermal motion of the noncrystalline molecules is suppressed under the strong electric field.