Formation of poly(vinylidene fluoride) crystalline phases from tetrahydrofuran/N, N-dimethylformamide mixed solvent
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Poly(vinylidene fluoride) (PVDF) is one of the semicrystalline polymers with at least four crystalline forms referred to as α, β, γ, and δ phase, among which the β phase has gained substantial importance due to its advantageous pyro- and piezo-electric properties [1, 2]. It requires a better method to induce the formation of β phase crystal in order to improve the electrical properties of PVDF. β phase is not usually obtained by crystallization from the melt, but it is normally obtained by various methods including tensile deformation and uniaxial compressional deformation of α phase [3, 4], blending with small contents of poly(methyl methacrylate) (PMMA) [5, 6] or poly(o-methoxyaniline) (POMA) , quenching and then annealing process , applying a strong electric field  and crystallizing from solution at appropriate conditions [10, 11, 12]. In all these methods which used to prepare β phase of PVDF, the one grown from a single solvent is widely used because of its facility and...
KeywordsDifferential Scanning Calorimetry PVDF Vinylidene Fluoride Semicrystalline Polymer POMA
This research is supported by the Key Project of BMSTC (D0406003040191).