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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.