Electrostatic processing of PVDF

摘要

Since the piezoelectric character of stretched, poled poly(vinylidene fluoride) (PVDF) was first reported in 1969, a significant body of research has been performed on PVDF trying to: (1) establish the microstructure that is responsible for the piezoelectric nature of the films, (2) develop techniques for producing reproducible piezoelectric PVDF films and (3) maximize the piezoelectric coefficients of the PVDF films. What has been determined is that the β-form (Fig.1) is the crystal phase that yields the highest piezoelectric coefficients, and the preferred commercial production of PVDF films involves a process wherein warmed, cast films of α-PVDF are drawn and then corona poled to yield reproducible piezoelectric polymer films. The inherent polymer film properties (flexible, lightweight, and high strength) make these films ideal for many applications requiring piezoelectric sensors.