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Abstract
Infrared spectra of β-PVDF films under the influence of an electric field were registered for 13 cycles of field strength. Butterfly-shaped hysteresis curves due to dipole orientation changes were obtained for the absorbances as well as for the frequencies of the bands at 445 and 510 cm−1. Investigations of α-PVDF show considerable changes in the spectra after polarization at field strengths of 180 MV/m to 320 MV/m. The absorbance decreases of the bands 218 cm−1 and 616 cm−1 were discussed in terms of a conformation conversion and of an alignment of the CF2 -dipoles in α-PVDF.