Effect of Drawing on the Crystal–Amorphous Interphase, Remanent Polarization and Dielectric Properties of α-PVDF Films

The effect of drawing on the dielectric properties and on the remanent polarization of α-PVDF was investigated. Films were drawing at 150°C and a draw ratio of 4. Calorimetric analyses and X-ray diffraction results indicated that drawing increases the degree of crystallinity and reduces the crystal-amorphous interphase. As a consequence an increase in stable polarization and in the dielectric properties was observed, as well as a strong reduction in the metastable polarization. To explain these results it was suggested that the crystal-amorphous interphase might be responsible for both the metastable polarization and the αc relaxation of the polymer.