Studies of poly(vinylidene fluoride)/poly(vinyl pyrrolidone) blends. I. Thermal transitions by differential scanning calorimetry

Journal of Polymer Science, Part B: Polymer Physics - Tập 27 Số 6 - Trang 1195-1208 - 1989
Giovanni C. Alfonso1, Antonio Turturro1, Maria Pizzoli2, Mariastella Scandola2, Giuseppina Ceccorulli2
1Istituto di Chimica Industriale, Università and Centro Studi Chimico-Fisici di Macromolecole Sintetiche e Naturali, CNR, Corso Europa, 30 16132 Genova, Italy
2Dipartimento di Chimica "G. Ciamician," Università and Centro di Studio per la Fisica delle Macromolecole, CNR, Via Selmi, 2 40126 Bologna, Italy

Tóm tắt

Abstract

Thermal measurements were carried out to investigate the macrostructure of as‐cast poly(vinylidene fluoride) (PVDF)/poly(vinyl pyrrolidone) (PVP) blends. At high PVP content, above about 70 wt.%, the two components form a homogeneously mixed amorphous phase whose Tg varies with composition. Crystals are formed upon casting mixtures richer in PVDF; these systems exhibit complex thermal behavior that cannot be justified by a simple two‐phase model. DSC measurements above room temperature on semicrystalline blends show, in addition to the melting of PVDF crystals at temperatures that decrease on increasing PVP content, a glass transition at about 80°C, independent of composition. Experimental results strongly support the hypothesis that an interphase, composed of essentially undiluted noncrystalline PVDF, is always associated with the lamellar crystals.

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Journal of Polymer Science, Part B: Polymer Physics

Tập 27 Số 6

1195-1208

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