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A. Jeziorny

DSC studies on the glass transition of poly (ethylene terephthalate) as a relaxation process

Polimery 1997, No 11-12, 674

DOI: dx.doi.org/10.14314/polimery.1997.674


Glass transition temperatures (Ts) of amorphous PET of various densities, determined by DSC at heating rates ranging from 1 to 20°C/min, showed the glass transition to be a relaxation process (Fig. 2), i.e., a temperature transition of kinetic type, rather than a second-order, transformation. The oscillation period of macromolecular chain segments, which is related to the density-controlled supra molecular structure of the polymer, was found to govern the kinetics of the glass transition process. A simple indicator qg(i) was suggested to describe the transition kinetics, easy to evaluate from appropriate DSC data.

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