Measurements of the shear piezoelectric coefficients d15 and d24 are reported for uniaxially oriented polyvinylidene fluoride (PVDF). Results are presented for non-voided sheet of low and high Young's modulus and for a low modulus voided sheet. In all cases samples of high Form I content were prepared, and subjected to comparable poling voltages. It is of interest to note that the values obtained for the shear coefficients are comparatively high (in the range -13 to -38 pCN-1) and in the case of d24 much greater than the calculated value for the Form I PVDF crystal.
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Nix et al. (1986) studied this question.
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