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Stretching induced phase transformations in melt extruded poly(vinylidene fluoride) cast films: Effect of cast roll temperature and speed
Author(s) -
Mhalgi Milind V.,
Khakhar Devang V.,
Misra Ashok
Publication year - 2007
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.20885
Subject(s) - materials science , crystallinity , composite material , phase (matter) , casting , fourier transform infrared spectroscopy , fluoride , birefringence , optics , inorganic chemistry , chemistry , physics , organic chemistry
Melt extruded poly(vinylidene fluoride) cast films were prepared at different cast roll temperatures and speeds to study the effect of casting temperature and preorientation of the melt on the α‐ to β‐phase transformation in these films after uniaxial stretching. X‐ray and fourier transform infrared spectroscopy were used to identify the crystalline phases. The unstretched films were characterized using small angle light scattering (SALS). The films were stretched to a stretch ratio of 4.2 and at 80°C. Birefringence of the films and the fraction of β‐phase [ F (β)] formed after uniaxial stretching increased with stretch ratio. The films showed increased crystallinity after stretching. For the films prepared at different cast roll temperatures, there was little change in F (β) in the films having a cast roll temperature between 75 and 120°C, but for the film with a cast roll temperature of 130°C F (β) decreased considerably. For the films prepared at different cast roll speeds, the F (β) increased with stretch ratio as well as with cast roll speed for a fixed stretch ratio. The primary effect of changing both the parameters is a change in the average spherulitic radius ( R ), in the unstretched films measured using SALS. The F (β) obtained correlated well with R and lower spherulitic radii resulted in the higher conversion to the β‐phase. POLYM. ENG. SCI., 47:1992–2004, 2007. © 2007 Society of Plastics Engineers