Abstract
The effect of water on the glass transition and the cold-crystallization of amrophous poly (ethylene terephtalate) (PET) was studied by differential scanning calorimetry. The glass transition temperature (Tg) of PET shifted 6-7K to the low temperature side in the presence of 1% water. At the same time, a sub-Tg was newly observed at temperature 10K lower than Tg. The starting temperature of the cold crystallization also decreased with increasing water content. The non-freezing water content was evaluated from the enthalpy of melting of water contained in PET. The amount of non-freezing water was small (0.5-1.0%), when it was compared with that of polymers having the hydrophilic group examined as a reference. However, this small amount of non-freezing water markedly induces the molecular rearrangement of PET.
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