Abstract
High pressure differential thermal analysis (DTA) was performed for a pseudobinary mixture of polyethylene (PE) and 1,2,4,5-tetrachlorobenzene crystallized at a cooling rate of about 5 K min−1 to study the change in melting temperature Tm with pressure and composition ratio. The phase diagram of the eutectic binary mixture at elevated pressures up to 400 MPa was determined. In the hypereutectic region of the phase diagram of PE, two endothermic peaks appeared in the DTA curve of melting and approached each other with pressure. In the hypoeutectic region, the distance between the two melting peaks increased with pressure. The pressure dependence of the eutectic point at 1 atm was 0.33°C MPa−1 on the average for all compositions. The DTA curve of the binary mixture under high pressure above 350 MPa indicated that the high pressure phase usually appearing in pure PE does not appear in PE in the binary mixture. The DTA curve at 1 atm of a sample crystallized under high pressure suggests that the extended chain crystal (ECC), easily formed by melt crystallization of pure PE above 350 MPa, was formed only slightly in the mixture even at a PE content 90%.
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Nakafuku, C. Melting and Crystallization of a Pseudo-Binary Mixture of Polyethylene and 1,2,4,5-Tetrachlorobenzene under High Pressure. Polym J 17, 869–875 (1985). https://doi.org/10.1295/polymj.17.869
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DOI: https://doi.org/10.1295/polymj.17.869
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