Ferroelectric hysteresis in simultaneously stretched and corona-poled PVDF films

SSCP (simultaneous stretching and corona poling) of PVDF (polyvinylidene fluoride) films has enhanced the ferroelectric properties. D-E hysteresis loops of these films were observed by using the Sawyer-Tower method in the field range 35 to 80 MV/m. The dependence of ferroelectric hysteresis on poling field has also been studied. The average value of remanent polarization approximate to 82 mC/m(2) was observed for the SSCP (simultaneous stretching and corona poling) films, which is significantly higher than the value P approximate to 62 mC/m(2) observed for the STCP (stretched and then corona poled) films. Coercive fields of E-c approximate to 61 and 50 MV/m were obtained for the SSCP and the STCP films respectively. A comparison of the rn spectra of the sscp and the step films in perpendicularly polarized light E-perpendicular to indicates that the dipolar orientation is better in the SSCP films.