The piezo-, pyro- and ferroelectric properties were investigated for extruded polyvinyl chloride films. The piezoelectric properties of films were found to be affected greatly by the presence of the plasticizer. The effects of annealing, poling conditions and poling modes were studied to optimize the piezoelectric properties. Due to the higher dipolar orientation, the simultaneous stretching and corona poling (SSCP) at an elevated temperature improves greatly the piezo- and pyroelectric properties of PVC film in comparison to stretched and corona poling (STCP). The maximum value of the piezoelectric coefficient ( d 31 )~7.2±1.1 pC N -1 was found to be for SSCP-PVC films. The pyroelectric coefficient was found to be ( p )~0.30 and 0.16 nC K -1 cm -2 at 35 °C for SSCP and STCP films, respectively. The observations of polarization hysteresis film loops suggest the existence of the cooperative dipolar motion in the PVC film. The maximum value of polarization was found to be ~7.0 and 6.0 nC m -2 under 78 MV m -1 electric field for SSCP and STCP films, respectively bending piezoelectric coefficient (β 331 ) of ~15 nC m -1 was found for SSCP films.
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Bharti et al. (2001) studied this question.
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