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Plasticization and Crystallization of Poly(ethylene Terephthalate) Induced by Water

Author： Chen Y. Lin Z. Yang S.

Publisher： Springer Publishing Company

ISSN： 1388-6150

Source： Journal of Thermal Analysis and Calorimetry, Vol.52, Iss.2, 1998-05, pp. : 565-568

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

Commercial poly(ethylene terephthalate) (PET) was treated at R. H.>80% and room temperature for a set time. The glass transition temperature (T_g) decreases with the time of exposure to high humidity. The decrease in T_g is a result of plasticization. Our data indicate that the T_g of dry PET of 76-78°C may decrease to as low a temperature as 65-67°C when it is wet. Induced crystallization of PET in the presence of water reduces the cold crystallization temperature (T_c). The structure of water-induced crystals is imperfect and can be improved in perfection by annealing.

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