Abstract
The effect of physical aging and de-aging on cold crystallization rates of polyethylene terephthalate, (PET) has been investigated by differential scanning calorimetry (DSC). Storage of amorphous PET below the glass transition increases the rates of subsequent cold crystallization on heating above the glass transition temperature, Tg, and the increase in rate depends on the extent of physical aging which has developed. Various effects, from the development of primary nuclei on storage to a general decrease of the fictive temperature, have been considered. Both SEM and hot stage light microscopy of the bulk crystallizing specimens show that physical aging increased the number of spherulites present in the sample. De-aging, by heating aged specimens to higher temperatures but below Tg, was observed to reduce the extent of physical aging and the increase in the rates of crystallization closely followed the residual extent of aging.
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