Work

Low-Temperature Uniaxial Orientation Effect on the Structure and Piezoelectric Properties of the Vinylidene Fluoride-Tetrafluoroethylene Copolymer Films

Year: 2025

Type: article

Abstract: The paper considers the uniaxial orientation effect on structure and piezoelectric properties of the vinylidene fluoride-tetrafluoroethylene copolymer ferroelectric films. The films were exposed to uniaxial orientation stretching in the temperature range from 20°C to 60°C; then, they were contact polarized under the normal conditions. Temperature dependence of the electric strength was determined. The longitudinal piezoelectric coefficient d33 values were measured by the quasi-static Berlincourt method. The piezoresponse force microscopy (PFM) method was used to investigate the film domain structure before and after polarization, and the local piezoelectric coefficient values were also calculated. Phase composition was studied using the differential scanning calorimetry and the infrared spectroscopy with the Fourier transform. It was found that uniaxial orientation stretching contributed to an increase in the piezoelectric coefficient d33 from 5 pC/N to 16…20 pC/N. The results obtained indicate importance of the amorphous phase contribution to formation of the piezoelectric properties in polymeric materials.

Source: International Journal of Molecular Sciences

DOI: 10.3390/ijms26136309