Effect of linear comonomers on the rate of crystallization of copolyesters

摘要

Small amounts of dimethyl-4-4'-biphenyldicarboxylate,2,7-dimethyl-4,5,9,10-tetrahydropyrenedicarboxylate,and dimethyl-2,7-pyrenedicarboxylate ahve been copolymerized into poly(ethylene )terephthalate(PET).The therma transitions of the copolymers have been characterized,and the crystallization rates have been measured isothermally.Avrami analysis indicates that all the copolymers crystallized at a slower rate than that of the PET homopolymer.Addition of perylene to the copolymers containing pyrene enhanced the rate of crystallization,which could be the consequence of stacked arene assemblies serving as templates for crystal formation.