Abstract
The thermodynamic relation between heat, entropy of fusion and melting point is used to calculate the melting point of polyethylene terephthalate from the melting points of several series of oligomers. The success of the method depends on the assumption that the heat and entropy of fusion per repeat unit are constant, in a series of oligomers, and it is shown that, in the series of linear diol oligomers higher than dimer, this assumption is approximately justified. This finding is in accord with crystallographic data.
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