Journal ArticleDOI
Effect of crystallization temperature on the crystalline phase content and morphology of poly(vinylidene fluoride)
Rinaldo Gregorio,Marcelo Cestari +1 more
TLDR
In this article, the effect of temperature on the crystallization of α, β, and γ phases of PVDF from dimethylacetamide (DMA) solution was studied, and the variation in the crystallinity content of these three phases was obtained as a function of temperature using infrared spectroscopy, differential scanning calorimetry (DSC), and x-ray diffraction techniques.Abstract:
The effect of temperature on the crystallization of α, β, and γ phases of PVDF from dimethylacetamide (DMA) solution was studied. Variation in the crystallinity content of these three phases was obtained as a function of temperature using infrared spectroscopy, differential scanning calorimetry (DSC) and x-ray diffraction techniques. Such variation is related to the dependence of the crystallization rate of each phase with temperature, and allowed a better understanding of some results found in the literature about the crystallization and interconversion of these phases. Micrographs of samples present morphologies that corroborate with the proposed explanations. © 1994 John Wiley & Sons, Inc.read more
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Journal ArticleDOI
Electroactive phases of poly(vinylidene fluoride) : determination, processing and applications
TL;DR: In this article, the main characteristics of the electroactive phases of polyvinylidene fluoride and copolymers are summarized, and some interesting potential applications and processing challenges are discussed.
Journal ArticleDOI
Ftir studies of -phase crystal formation in stretched pvdf films
A Salimi,A A Yousefi +1 more
TL;DR: In this article, the appearance of β-phase in compression molded films of two different grades of poly vinylidene fluoride (PVDF) resin was analyzed using FTIR spectra.
Journal ArticleDOI
A critical analysis of the α, β and γ phases in poly(vinylidene fluoride) using FTIR
TL;DR: In this article, a universal phase identification procedure using only the Fourier transform infrared spectroscopy (FTIR) results is proposed and validated, which can differentiate the three phases by checking the bands around 763 and/or 614, 1275, and 1234 cm−1 for the α, β and γ phases, respectively.
Journal ArticleDOI
Determination of the α, β, and γ crystalline phases of poly(vinylidene fluoride) films prepared at different conditions
TL;DR: In this paper, the three crystalline phases of poly(vinylidene fluoride), α, β, and γ, have been obtained under distinct crystallization conditions, and the presence of the three phases in each sample were confirmed by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), wide-angle X-ray scattering (WAXD), polarized light optical microscopy (PLOM), and scanning electron microscopy(SEM).
Journal ArticleDOI
Effect of crystalline phase, orientation and temperature on the dielectric properties of poly (vinylidene fluoride) (PVDF)
Rinaldo Gregorio,E. M. Ueno +1 more
TL;DR: In this article, the effect of crystalline phase, uniaxial drawing and temperature on the real (e′) and imaginary (e″) parts of the relative complex permittivity of poly (vinylidene fluoride) (PVDF) was studied in the frequency range between 102 and 106 Hz.