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Spatio-Temporal Growth Of Broken Spiral And Concentric Ringed Spherulites In Blends Of Poly(Vinylidene Fluoride) And Ethylene-Vinylacetate Copolymers, Yoshifumi Okabe, Thein Kyu
Spatio-Temporal Growth Of Broken Spiral And Concentric Ringed Spherulites In Blends Of Poly(Vinylidene Fluoride) And Ethylene-Vinylacetate Copolymers, Yoshifumi Okabe, Thein Kyu
Thein Kyu
Melting and crystallization behavior in mixtures of poly(vinylidene fluoride) (PVDF) and several ethylene-vinyl acetate copolymers (EVAc) with various ethylene contents have been investigated by means of differential scanning calorimetry, atomic force microscope, and optical microscopy. PVDF/EVAc-80 exhibits the melting point depression of PVDF crystals, suggestive of a miscible character of the pair. Crystallization behavior and morphology development in blends of PVDF/EVAc-80 have been investigated with an emphasis on the spherulitic growth demonstrating the spiral and concentric ringed (or target) patterns. Of particular interest is the break-up of the spiral or concentric ringed patterns at very shallow supercoolings, which may be …