effect of uniaxial orientation on the dielectric relaxation behavior of α-PVDF

α-crystalline phase poly(vinylidene fluoride) (PVDF) film was oriented uniaxially at different draw ratios. Morphological effects of orientation were investigated by X-ray diffraction and differential scanning calorimetry (DSC) measurements on the oriented samples. The dielectric loss factor was mea...

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Bibliographic Details
Published in:Journal of applied polymer science 2008-09, Vol.109 (6), p.3878-3886
Main Authors: Ozkazanc, E, Guney, H.Y, Oskay, T, Tarcan, E
Format: Article
Language:English
Subjects:
activation energy
Applied sciences
dielectric loss factor
dielectric relaxation
Electrical, magnetic and optical properties
Exact sciences and technology
Organic polymers
orientation
Physicochemistry of polymers
poly(vinylidene fluoride)
Properties and characterization
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Summary:α-crystalline phase poly(vinylidene fluoride) (PVDF) film was oriented uniaxially at different draw ratios. Morphological effects of orientation were investigated by X-ray diffraction and differential scanning calorimetry (DSC) measurements on the oriented samples. The dielectric loss factor was measured from 100 Hz to 1 MHz range between 80 and 400 K as a function of frequency and temperature. While the activation energy of the α-relaxation transition was not affected by the orientation, it was observed that there is a linear increase in the activation energy of the β-relaxation transition with draw ratio. The relaxation time of the β-relaxation transition was more affected by the orientation process at lower temperatures.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.28617