Differential thermal analysis (DTA) was used to measure crystallization, melting, and glass transition temperatures of poly(ethylene terephthalate), poly‐1,4‐cyclohexylene‐dimethylene terephthalate, and some copolyesters. These values are affected in different ways by systematic changes in such factors us copolymerination, molecular block formation, crystal perfection, nucleation, thermal history, and orientation. At least two types of abnormally high melting structures were formed and identified. The stability of these polymers to thermal and oxidative degradation was studied by DTA.
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Schulken et al. (1964) studied this question.
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