The effect of plasticizer on the polarization of poly(vinylidene fluoride) films

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Abstract
Plasticized and unplasticized, unoriented phase II poly(vinylidene fluoride) (PVF2) films were poled at fields ranging from 0.5 to 1.25 MV/cm at room temperature for 10 min. X‐ray diffraction data revealed that at fields near 1.0 MV/cm, a change in conformation to produce phase I occurred. The amount of phase I produced was found to be significantly higher in the case of plasticized film. The plasticized films also showed higher piezoelectric strain coefficient d31, stress coefficient e31, and pyroelectric coefficient P y, as compared to unplasticized films subjected to identical poling conditions. In a similar study of oriented phase I films (obtained by stretching plasticized and unplasticized phase II films), poling fields ranging from 0.5 to 2.0 MV/cm were used. The Bragg angle for the (110), (200) reflection was found to be higher for the poled plasticized films (compared to the poled unplasticized films) with 2θ increasing with increasing plasticizer content. Py, e31, and d31 were also higher as compared to the unplasticized films.