Abstract
The effect of annealing and quenching tempera- tures on the crystallinity, β phase fraction and dielectric be- havior of poly (vinylidene fluoride) (PVDF) have been stud- ied. The crystallinity and β phase fraction of these films were evaluated using X-ray diffraction and FTIR techniques for different annealing and quenching temperatures. It is seen that the thermal processing conditions play a crucial role in deter- mining the dominant phase in PVDF. The β phase PVDF is the most desired phase for device applications such as sensors and actuators. Hence, the thermal processing conditions are optimized for obtaining β rich PVDF films. The β rich phase ofPVDFisobtainedfor filmswhichareannealedat80°Cand quenchedat 20 °C. The as-synthesized films for the optimized processing conditions was studied for their dielectric behavior and was found to exhibit dielectric constant as high as ~60.
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