Abstract
Differential thermal analysis of polyethylene crystals was made at pressures up to 5 kbar. The crystals studied were fully extended chain crystals of two low molecular weight fractions, and a solution-grown crystal of a high molecular weight fraction. The melting curves of the former crystals were represented by the Simon equation. The latter crystal, having a lamellar thickness of 180Å, showed reorganization during the heating process in the differential thermal analysis at 2.5 kbar and above. In order to determine accurately its melting temperature at 5 kbar a pressure annealing experiment was made. These results showed that the depression of the melting temperature of folded-chain crystals is considerably smaller, even at high pressures, than that reported previously. The slopes of the melting curves at atmospheric pressure are almost the same for all the crystals studied. This fact can be reasonably interpreted on the basis of a two-phase model.
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Takamizawa, K., Ohno, A. & Urabe, Y. Effect of Pressure on Melting Temperatures of Polyethylene Fractions. Polym J 7, 342–351 (1975). https://doi.org/10.1295/polymj.7.342
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DOI: https://doi.org/10.1295/polymj.7.342
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