Piezoelectricity of PVDF/PUE, PVDF/PMMA and PVDF/PMMA+BaTiO/sub 3/ laminates

Preparation of piezoelectric laminates by using PVDF polymer film (a), polyester urethane elastomer film (b), PMMA film (c), and (PMMA+BaTiO/sub 3/) composite film (d) is proposed. Three-layered-structure systems of (aba), (aca), and (ada) have been made and conventional electrets based on these laminates have been prepared. The modification of internal layers in the systems leads to a change of their dielectric properties and also the mechanical parameters which determine the piezoelectricity. The origins of piezoelectricity in these systems have been considered on the basis of TSD thermograms.<
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