In order to explore new substitutes for 2,5-furandicarboxylic acid (FDCA) or poly(ethylene 2,5-furandicarboxylate) (PEF) and try to develop more ideal bio-based polyesters, several thiophene-aromatic polyesters (PETH, PPTH, PBTH, and PHTH) were synthesized from dimethyl thiophene-2,5-dicarboxylate (DMTD) and different diols, including ethylene glycol, 1,3-propanediol, 1,4-butanediol, and 1,6-hexanediol. The chemical structures of obtained polyesters were confirmed by nuclear magnetic resonance spectroscopy (¹H-NMR and ¹³C-NMR). Determined by GPC measurement, their average molecular weight (M_w) varied from 5.22 × 10⁴ g/mol to 7.94 × 10⁴ g/mol with the molar-mass dispersity of 1.50–2.00. Based on the DSC and TGA results, the synthesized polyesters PETH, PPTH, and PBTH displayed comparable or even better thermal properties when compared with their FDCA-based analogues. From PETH to PHTH, their T_g varied from 64.6 °C to −1 ×C while T_5% ranged from 409 °C to 380 °C in nitrogen atmosphere. PETH showed elongation at break as high as 378%, tensile strength of 67 MPa, and tensile modulus of 1800 MPa. Meanwhile, the CO₂ and O₂ barrier of PETH was 12.0 and 6.6 folds higher than those of PET, respectively, and similar to those of PEF. Considering the overall properties, the synthesized thiophene-aromatic polyesters, especially PETH, showed great potential to be used as an excellent bio-based packaging material in the future.

为了探索2,5-呋喃二甲酸（FDCA）或聚（2,5-呋喃二甲酸乙烯酯）（PEF）的新替代品，并尝试开发更理想的生物基聚酯，几种噻吩-芳族聚酯（PETH，PPTH， PBTH和PHTH是由噻吩-2,5-二羧酸二甲酯（DMTD）和不同的二醇（包括乙二醇，1,3-丙二醇，1,4-丁二醇和1,6-己二醇）合成的。通过核磁共振波谱（¹ H-NMR和¹³ C-NMR）确认得到的聚酯的化学结构。通过GPC测量确定，它们的平均分子量（M _w）从5.22×10 ⁴ g / mol到7.94×10 ⁴g / mol，摩尔质量分散度为1.50–2.00。根据DSC和TGA结果，与基于FDCA的类似物相比，合成聚酯PETH，PPTH和PBTH表现出可比甚至更好的热性能。从PETH到PHTH，在氮气氛中，它们的T _g在64.6°C到-1×C之间变化，而T _5％在409°C到380°C之间变化。PETH的断裂伸长率高达378％，拉伸强度为67 MPa，拉伸模量为1800 MPa。同时，CO ₂和O ₂PETH的屏障分别比PET高12.0倍和6.6倍，与PEF相似。考虑到整体性能，合成的噻吩-芳族聚酯，尤其是PETH，显示出巨大的潜力，将来可以用作优良的生物基包装材料。