Abstract
PET fibres, with different degrees of crystallinity induced by different thermal treatments have been investigated by DTA, X-ray diffraction and iodine sorption techniques and the results have been compared with the mechanical properties of the yarns spun from these fibres. Values for the degree of crystallinity have been plotted vs. temperature at which thermal treatment was carried out and the curves obtained have been compared with graphs of mechanical properties vs. temperature. Good agreement of the results from the three different methods was obtained.
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