Author : A. Al-Ajaj, Ekram
journal of kerbala university,
Volume 4, Issue 2, Pages 201-208
The crystalline structure, band vibration and piezoelectric properties of PVDF (neat and blend) oriented in the -phase have been investigated utilizing X-ray diffraction, infrared spectroscopy and piezoelectric measurements respectively. The -phase and -phase always exist in the solvent cast films, but with fading orientation caused by the blending content of PMMA and PVAc. Miscibility in the PVDF-PVAc blend was confirmed by vibrational band shift. It was found that the piezoelectricity of PVDF blends might strongly be affected by the final crystal structure of PVDF resulted from blending process and on the nature of blending polymer. However, the magnitude of piezoelectric constant d33 was found to be decreasing with the content of blending polymer for both PVDF-PMMA and PVDF-PVAc blends.