Determination of the α, β, and γ crystalline phases of poly(vinylidene fluoride) films prepared at different conditions

Rinaldo Gregorio

doi:10.1002/app.23137

journal article Feb 27, 2006

Determination of the α, β, and γ crystalline phases of poly(vinylidene fluoride) films prepared at different conditions

Rinaldo Gregorio

Journal of Applied Polymer Science Vol. 100 No. 4 pp. 3272-3279 · Wiley

View at Publisher Save 10.1002/app.23137

Abstract

AbstractSamples containing the three crystalline phases of poly(vinylidene fluoride), α, β, and γ, have been obtained under distinct crystallization conditions. Samples containing exclusively unoriented β phase have been obtained by crystallization from dimethylformamide (DMF) solution at 60°C. Oriented β phase has been obtained by uniaxial drawing, at 80°C, of an originally α phase sample. Samples containing exclusively α phase have been obtained by melting and posterior cooling at room temperature. Samples containing both α and γ phases have been obtained by melt crystallization at 164 °C for 16 and 36 h. Presence of the crystalline 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). Infrared absorption bands identifying unequivocally the presence of β and γ phases in a sample are presented. It is shown that solution crystallization at T < 70°C always results in the β phase, regardless of the solvent used. Melt temperatures of the respective phases have also been determined. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3272–3279, 2006

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Citations

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References

Details

Published: Feb 27, 2006
Vol/Issue: 100(4)
Pages: 3272-3279
License: View

Authors

R

Rinaldo Gregorio

Cite This Article

Rinaldo Gregorio (2006). Determination of the α, β, and γ crystalline phases of poly(vinylidene fluoride) films prepared at different conditions. Journal of Applied Polymer Science, 100(4), 3272-3279. https://doi.org/10.1002/app.23137

Determination of the α, β, and γ crystalline phases of poly(vinylidene fluoride) films prepared at different conditions

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