Abstract
A hypothesis proposed for semicrystalline polymers as metastable, microheterogenous, three-dimensionally structured liquids with crystallites as grid sites is developed. The phase diagram of the isotactic polypropylene (PP)-dibutyl phthalate system obtained via this approach is discussed in detail. Additional arguments for the thermodynamic nonequivalence of the liquidus line in this and similar systems, on one hand, and in the systems of low-molecular-mass crystalline-liquids, on the other hand, are given. The appearance of a boundary curve, reflecting the transition of the original two-phase system into a single phase, such as a liquid-solution in a polymer, on the phase diagram of the semicrystalline polymer-liquid system is shown to fundamentally change the technological meaning of the diagram, thereby clarifying the mechanism of microporous-membrane formation from solutions of semicrystalline polymers via thermally induced phase separation.
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Original Russian Text © L.N. Mizerovskii, K.V. Pochivalov, T.N. Lebedeva, R.Yu. Golovanov, L.A. Antina, 2015, published in Vysokomolekulyarnye Soedineniya. Ser. A, 2015, Vol. 57, No. 4, pp. 295–305.
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Mizerovskii, L.N., Pochivalov, K.V., Lebedeva, T.N. et al. Phase equilibrium of a semicrystalline polymer-liquid system: Isotactic polypropylene-dibutylphthalate. Polym. Sci. Ser. A 57, 389–398 (2015). https://doi.org/10.1134/S0965545X15040100
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DOI: https://doi.org/10.1134/S0965545X15040100