Dielectric properties of solution-cast poly(vinylidene fluoride) films

• Published in: Journal of materials science Vol. 22; no. 6; pp. 2006 - 2010
• Main Authors: RASHMI, NARULA, G. K, PILLAI, P. K. C
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.06.1987
• Subjects: Applied sciences; Electrical, magnetic and optical properties; Exact sciences and technology; Physical properties; Polymer industry, paints, wood; Properties and testing; Technology of polymers; Film; Dielectric properties; Vinylidene fluoride polymer
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/BF01132931

Dielectric parameters have been measured for solution-cast films of poly(vinylidene fluoride) (PVDF) in the temperature range 40-120 deg C and frequency range 50 Hz-1 MHz. The infrared absorption spectrum shows these films to be predominantly of Phase III crystal structure. The alpha sub c relaxation, which has generally been reported in the literature for Phase II PVDF, does not appear in the dielectric loss spectra. A small loss peak is observed which could probably be assigned to alpha ' relaxation arising from molecular motions in the folds on the surface of the crystallites. Only a part of the alpha sub a relaxation is observed, due to the limitations of the experimental range of temperature and frequency. Trapped charge carriers make a large contribution to the dielectric parameters at lower frequencies. 30 ref.--AA