The poling field and drawing dependence of the structure of piezoelectric poly(vinylidene fluoride) F2-ME films: IR and X-ray studies

摘要

IR (infrared)-transmission spectra as dependent on poling field and drawing in PVDF (F2-ME) corona poled films was recorded in the 400-4000 cm/sup -1/ range with a diffraction spectrometer and in the 20-600 cm/sup -1/ range with a Fourier spectrometer. Libration mode absorption bands at 67 and 58 cm/sup -1/ due to TTT and TGTG-conformations may be used for estimation of beta - and alpha -phase contents, respectively X-ray diffraction spectra for the radiation direction coincided with the drawing direction of multilayered specimens showing 001 beta and 002 alpha reflections. The drawing ratio dependence of the piezoelectric coefficient d/sub 31/ exhibited a maximum attributed to beta -phase to amorphous phase transformation at large drawing ratios.