Miscibility and crystalline properties of poly(vinylidene fluoride)/poly(vinylidene fluoride­trifluorochloroethylene) blends

The poly(vinylidene fluoride)/poly(vinylidene fluoride­chlorotrifluoro ethylene) blend membranes were prepared by a solution cast approach after physical blending. The miscibility, crystallization properties and surface morphology of the samples were investigated by differential scanning calorimetry, X­ray diffraction, Fourier transform infrared spectra and scanning electron microscopy. The results show that the random copolymer P(VDF­CTFE) in the PVDF/P(VDF­CTFE) blends has a certain miscibility with PVDF, which affects the crystal­melt thermodynamic characteristics of PVDF. In PVDF/P(VDF­CTFE) blend crystallization process, P(VDF­CTFE) is beneficial for the formation of β phase. PVDF is well distributed in the PVDF/P(VDF­CTFE) blends. The spherulite is reduced by decreasing the content of the PVDF.