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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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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description 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.
doi_str_mv 10.1002/app.28617
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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
title effect of uniaxial orientation on the dielectric relaxation behavior of α-PVDF
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