A series of copolyesters based on poly(trimethylene terephthalate) derived from 2,5-thiophenedicarboxylic acid (TFDCA) have been successfully synthesized by the melting polymerization. Microstructures and molecular weights were characterized by ¹H NMR and size exclusion chromatography (SEC), respectively. Meanwhile, thermal properties, crystallization behaviors, and crystal structures were investigated by DSC, TGA, and WAXD. The results confirmed the copolymer compositions were nearly equal to the feed compositions. The weight molecular weights were all higher than 21000 g/mol for all polyesters synthesized. With increasing the TFDCA content, the glass transition temperature decreased slightly due to the weaker rigidity of the thiophene ring. DSC and WAXD results demonstrated that the isodimorphic behavior occurred for poly(trimethylene 2,5-thiophenedicarboxylate-co-trimethyleneterephthalate)s (PTTTFs). When TFDCA content was 25%, PTTTF25 exhibited the moderate tensile strength (53.1 MPa). However, the high elongation at break (396%) was observed due to the β relaxation and strain-induced crystallization.

通过熔融聚合成功地合成了一系列衍生自2,5-噻吩二甲酸（TFDCA）的基于聚对苯二甲酸丙二醇酯的共聚酯。微观结构和分子量的特征为¹1 H NMR和尺寸排阻色谱法（SEC）。同时，通过DSC，TGA和WAXD研究了热性质，结晶行为和晶体结构。结果证实共聚物组成几乎与进料组成相同。对于所有合成的聚酯，重均分子量均高于21000g / mol。随着TFDCA含量的增加，由于噻吩环的刚性较弱，玻璃化转变温度略有降低。DSC和WAXD结果表明，聚（1,2,5-噻吩二甲酸三亚甲基酯-共-对苯二甲酸亚丙基酯）（PTTTF）发生了同构行为。当TFDCA含量为25％时，PTTTF25表现出中等的拉伸强度（53.1MPa）。然而，