Studies on α to β phase transformations in mechanically deformed PVDF films

PVDF cast films were drawn at different temperatures to different draw ratios at constant draw rate to understand the mechanism of α to β phase transformation during mechanical deformation. WAXD and FTIR studies were carried out to determine the formation and content of β phase in the drawn films. L...

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Bibliographic Details
Published in:Journal of applied polymer science 2010-09, Vol.117 (6), p.3491-3497
Main Authors: R. P., Vijayakumar, Khakhar, Devang V, Misra, Ashok
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Forms of application and semi-finished materials
FTIR
Miscellaneous
Polymer industry, paints, wood
PVDF
SALS
Technology of polymers
uniaxial deformation
WAXD
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Summary:PVDF cast films were drawn at different temperatures to different draw ratios at constant draw rate to understand the mechanism of α to β phase transformation during mechanical deformation. WAXD and FTIR studies were carried out to determine the formation and content of β phase in the drawn films. Lower stretch temperatures gave higher fractions of β phase. The cast PVDF films were also drawn at suitable temperatures below the PVDF ambient melting point to the draw ratio of 6.4. The highest fraction of β phase obtained in these ultra drawn films was 0.98. SALS studies carried out for films at different stretch ratios show the change in spherulitic structure with the stretching parameters and give information for the understanding of phase transformation during stretching of PVDF films.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.32218