Abstract
Poly(vinylidene fluoride) (PVDF) is a semicrystalline polymer that exists in four crystalline phases (α, β, γ, δ). Among these, the β-phase has received tremendous techno-commercial importance due to its higher dipole moment as compared to the other phases, and thus many strategies have been explored in the recent past to obtain the β-polymorph of PVDF. In this study, the effect of shear history on crystalline morphology and behavior of PVDF has been investigated systematically by polarized optical microscopy coupled to a hot stage, Fourier transform infrared spectroscopy, differential thermal analysis, rheometry, and dielectric relaxation spectroscopy. Thin films of PVDF (120–150 μm) were sheared at different temperatures ranging from 155 to 220 °C and were allowed to isothermally crystallize at 155 °C. When the samples were isothermally crystallized at 155 °C, a remarkable increase in β-phase content was observed. More interestingly, this phenomenon was observed to be shear history dependent. For instan...
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