Abstract
Preparation of piezoelectret films with ordered void structure by using a template method is described. The structure of films consists of two layers of non-porous fluoroethypropylene (FEP) and one layer of non-porous polytetrafluorothylene (PTFE). The piezoelectricity of such fluorocarbon polymer films is investigated by measuring the quasi-static piezoelectric d 33 coefficients using positive piezoelectric effect. And the thermal stability of the films is studied by taking the measurement of d 33 decay at elevated temperatures. The results show that the quasi-static piezoelectric d 33 coefficients around 300 pC/N are achieved and its Young's modulus is about 0.28 MPa. Compared with the fluorocarbon polymer films with disordered void structure, the films with ordered structure shows a much improved thermal stability of d 33 . Pre-aging treatment can further improve the thermal stability of d 33 .
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