The effect of units derived from diethylene glycol (DEG) on the crystallization behaviour and linear growth rate of spherulites of poly(ethylene terephthalate) (PETP) free of metal catalyst residues, is studied by means of differential scanning calorimetry (DSC), small‐angle light scattering (SALS), polarized light microscopy (PLM), and transmission electron microscopy (TEM). The results show that the crystallization behaviour does not depend only on the temperature of crystallization, but also on a large scale on the content of DEG. In hot crystallization, the rate of PETP crystallization decreases with increasing DEG content; in cold crystallization, this effect is not so prominent. The higher the DEG content, the smaller is the number of nuclei and therefore the linear growth rate of PETP and, at the same time, the size of the spherulites becomes greater.
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Yu et al. (1986) studied this question.
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