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Influence of melt-draw ratio on the structure and properties of poly(vinylidiene fluoride) cast film

The polyvinylidene fluoride cast film was prepared with different melt-draw ratios by a cast extrusion process. The structure and properties of the prepared films were characterized by differential scanning calorimetry, X-ray diffraction, Fourier transform infrared and scanning electrical microscopy. The results showed that with increasing melt-draw ratio, the crystalline orientation increased and the crystalline morphology transformed from spherulites to parallel lamellae perpendicular to the extrusion direction. At the same time, necking behavior in the stress–strain curves disappeared and strain-hardening behavior became apparent. The lamellae thickness distribution became uniform. The polarized Fourier transform infrared results also indicated the existence of some β-phase for the samples with different melt-draw ratios.