Piezo-electric properties of polypropylene laminates with a non-woven layer

In the paper piezoelectric properties of non-uniform dielectric structures with elastic layers made from unwoven fabric are presented. Piezoelectric properties of the samples were studied through measurement of piezoelectric d33 coefficient, and carried out in dependence on static pressure. The characteristics d33=f (p) obtained for the laminates were hyperbolic type. In order to elucidate this kind of relationship, a theoretical model has been proposed. Based on the new model, the calculated d33 piezoelectric coefficients showed good agreement with the experimental results. According to the model developed, the d33 (p) dependence is related to the changes of the unwoven structure elastic modulus Y under the influence of static pressure. The magnitude of this change is strongly influenced by the structure of the non-uniform layer, including the fiber diameter, the number of fibers and their arrangement, and the fiber elasticity modulus.

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