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γ→β Phase transformation induced in poly(vinylidene fluoride) by stretching

✍ Scribed by R. Imamura; A. B. Silva; R. Gregorio Jr.

Publisher: John Wiley and Sons
Year: 2008
Tongue: English
Weight: 214 KB
Volume: 110
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.28851

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✦ Synopsis

Abstract

The purpose of this work was to show in a conclusive way the γ→β phase transformation induced by uniaxial stretching in poly(vinylidene fluoride). Poly(vinylidene fluoride) films were melted and crystallized at 163°C for 36 h. Under these conditions, a mixture of α and γ phases was formed, with a predominance of the latter. These films were uniaxially stretched at 130°C at a draw ratio of 4. Fourier transform infrared and differential scanning calorimetry analyses showed a γ→β phase transition in the solid state, whereas orientation of the α phase without any transition was observed. Optical microscopy analysis permitted the observation of the transformation of spherulitic structures into oriented lamellae during stretching. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

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