The aim of this study was to investigate the feasibility of replacing petroleum-based terephthalic acid (PTA) with renewable 2,5-thiophenedicarboxylic acid (TDCA) in poly(ethylene terephthalate) (PET), a series of copolyesters were synthesized from PTA, TDCA and ethylene glycol (EG). The effects of composition on structures, thermal properties, mechanical properties and β relaxation were studied. With the increase of the TDCA content, the esterification reaction time is noticeably shorter in the first step because the acidity of TDCA is stronger. PET, PETF and PETTF25 are semi-crystalline materials. However, no melting and crystallization peaks were observed for PETTF49 and PETTF74. All polyesters exhibit high tensile strength (56.0-68.8 MPa) and good toughness (elongation at break: 190-508%). With the increase of the TDCA content, β relaxation peak is shifted to a higher temperature. For all PET, PETF, and PETTFs, high peak intensity of the β relaxation can be achieved, indicating that the motions of more units are believed to contribute to the relaxation behavior.

这项研究的目的是研究在聚对苯二甲酸乙二酯中用可再生的2,5-噻吩二甲酸（TDCA）代替石油对苯二甲酸（PTA）的可行性（PET），由PTA，TDCA和乙二醇（EG）合成了一系列共聚酯。研究了组成对结构，热性能，力学性能和β弛豫的影响。随着TDCA含量的增加，第一步中的酯化反应时间明显缩短，因为TDCA的酸性较强。PET，PETF和PETTF25是半结晶材料。但是，未观察到PETTF49和PETTF74的熔融和结晶峰。所有聚酯均显示出高拉伸强度（56.0-68.8 MPa）和良好的韧性（断裂伸长率：190-508％）。随着TDCA含量的增加，β弛豫峰向更高的温度移动。对于所有PET，PETF和PETTF，都可以实现β弛豫的高峰值强度，