Phase Diagrams of Semicrystalline Polymer–Crystalline Substances: Polyolefins–1,2,4,5-Tetrachlorobenzeneстатья

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Дата последнего поиска статьи во внешних источниках: 24 мая 2017 г.

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[1] Phase diagrams of semicrystalline polymer–crystalline substances: Polyolefins–1,2,4,5-tetrachlorobenzene / K. V. Pochivalov, Y. V. Kudryavtsev, A. V. Basko et al. // Journal of Macromolecular Science - Physics. — 2015. — Vol. 54, no. 12. — P. 1427–1437. The full phase diagrams of low-density polyethylene (LDPE), high-density polyethylene (HDPE), and isotactic polypropylene (i-PP) mixtures with 1,2,4,5- tetrachlorobenzene (TeCB), including the solubility curve of TeCB in a solid polymer, were constructed by an optical method. The diagrams contain a eutectic point that corresponds to the situation when the crystallization of TeCB out of its solution in a polyolefin is accompanied by the crystallization of monomer units of the macromolecules. As a result, the polymer acquires a gel structure with crystallites as crosslinks and amorphous regions saturated with TeCB. It is demonstrated that the eutectic point position on the phase diagram can be used for ranking polymers with respect to their thermodynamic affinity to a solvent. For the studied systems, the affinity to TeCB was decreased in the order i-PP, HDPE, and LDPE. Direct experimental evidence was obtained that TeCB crystals can be dissolved in a solid polymer via a vapor phase mechanism, which leads to the polymer amorphization. [ DOI ]

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