Abstract
Copolymers of poly(ethylene terephthalate) (PET) containing small amounts of 4,4’-diphenyldicarboxylic acid (DP) and p,p’-quaterphenyldicarboxylic acid (QP) were prepared and their crystallization behavior was characterized by isothermal crystallization with the time-resolved light scattering method. The DP-containing copolymers showed spherulitic growth like PET homopolymer. The crystallization rate for DP-containing copolymers decreased and the induction time increased with comonomer content, which showed that DP unit disturbed the crystallization of PET segments. In the case of QP-containing copolymers, accelerated crystal nucleation was observed for 5–7.5 mol% copolymers. However, their crystallization rates were the same order as that of PET. Remarkable increase in crystallization rate, observed for some rigid arylate units-containing copolyesters in previous works, was not detected in these copolymers. The rigidity of QP is high enough to induce the aggregation of QP-rich segments, but the following orientation of ethylene terephthalate chains seems not to be accelerated in the course of crystallization.
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