Abstract:

In order to improve the piezoelectric performance of poly (vinylidene fluoride) (PVDF), PVDF/ATO/TiO2 composite piezoelectric membrane was prepared by electrostatic spinning combined with filler blending. Influences of the antimony tin oxide (ATO)/TiO2 content on diameter, morphology, crystallization and contents of β phase and  γ phase of the monofilament of the membrane. The scanning electron microscope, Fourier transform infrared spectrum and differential scanning calorimeter were used to characterize the microscopic morphological structure and crystallization structure of the fibrous menbrane material. The piezoelectric performance testing results of the PVDF/ATO/TiO2 composite membrane show that electrostatic spinning is an effective method to impeove the content of β phase in the PVDF. Moreover, the addition of ATO/TiO2 not only induces the oriented crystallizatio to form more β phase and γ phase, but also stabilizes the conformation formed during electrostatic spinning, resulting in better piezoelectric performance. Besides, after the addition of ATO/TiO2, the mechanical properties of PVDF fibrous membranes are impeoved to a certain extent.

Key words: poly (vinylidene fluoride), antimony tin oxide/TiO2, electrostatic spinning, piezoelectric membrane