Abstract
For poly(ethylene terephthalate) crystallized and/or annealed under elevated pressure, the melting behavior was studied, using a differential scanning calorimetry technique at atmospheric pressure. The melting point of the sample crystallized from the melt by slow cooling under elevated pressure is lower than that of the sample crystallized at atmospheric pressure, although the former sample has a slightly thicker lamella than the latter one. This implies that the fold surface energy is much larger in the elevated pressure crystallized sample. The atmospheric pressure melting point increases greatly by annealing under elevated pressure. In particular, a remarkable increase in melting point is observed at the early stage of the annealing for the elevated pressure crystallized sample, which may be due mainly to the decrease in fold surface energy in addition to lamella thickenning. An electron micrograph of the sample annealed for a long period after the melt crystallization under elevated pressure shows a morphology of a band structure composed of extended-chain-like crystal.
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Hiramatsu, N., Hirakawa, S. Melting Behavior of Poly(ethylene terephthalate) Crystallized and Annealed under Elevated Pressure. Polym J 12, 105–111 (1980). https://doi.org/10.1295/polymj.12.105
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DOI: https://doi.org/10.1295/polymj.12.105