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γ→β Phase transformation induced in poly(vinylidene fluoride) by stretching
Author(s) -
Imamura R.,
Silva A. B.,
Gregorio R.
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.28851
Subject(s) - differential scanning calorimetry , materials science , fourier transform infrared spectroscopy , fluoride , phase (matter) , polymer chemistry , optical microscope , phase transition , transformation (genetics) , polymer , infrared , composite material , chemical engineering , scanning electron microscope , chemistry , thermodynamics , optics , organic chemistry , inorganic chemistry , biochemistry , physics , gene , engineering
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