Abstract
Crystallization properties of the copolymers of poly(ethylene terephthalate) (PET) comprising small amount of 4,4′-isopropylidenediphenol (bisphenol-A) and bis(4-hydroxyphenyl)sulfone (bisphenol-S) units were compared by isothermal crystallization with the time-resolved light scattering method. These copolyesters were prepared from PET, terephthalic acid and diol diacetates by acidolysis reaction and following polycondensation. The copolymers showed a spherulite growth like PET homopolymer, though their crystallization rates decreased and induction times increased with increase in comonomer content. An accelerated nucleation, which was observed in the case of some rigid arylate units-containing copolyesters, was not detected in these copolymers. The bisphenol-S-containing copolymers showed lower crystallizability than the corresponding bisphenol-A-containing copolymers.
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