Polyethylene terephthalate (PET) refers to a widely used thermoplastic polymer that is difficult to degrade naturally. Therefore, large amounts of waste PET need to be recycled. In this study, to achieve a green and efficient method to degrade and recycle waste PET for new functional chemicals, PET waste was first swelled with acetic acid. Then, it was degraded under atmospheric pressure at 70 °C for 4 h using ethanolamine as solvent. The degradation efficiency of PET was higher than conventional methods because of the swelling-induced pores caused by the acetic acid. The aminolysis product bis(2-hydroxyethyl) terephthalamide was confirmed by Fourier transform infrared and nuclear magnetic resonance characterization methods and could be readily separated and recovered from the solvent. Finally, the degradation mechanism was discussed. This research provides a feasible and efficient approach to realize the recycling of PET with high value.

聚对苯二甲酸乙二醇酯 (PET) 是一种广泛使用的热塑性聚合物，难以自然降解。因此，大量废旧PET需要回收利用。在这项研究中，为了实现一种绿色高效的方法来降解和回收废旧 PET 用于新的功能化学品，首先用醋酸膨胀 PET 废物。然后，使用乙醇胺作为溶剂，在 70 °C 的大气压下降解 4 h。PET 的降解效率高于传统方法，因为乙酸引起的溶胀诱导孔。氨解产物双（2-羟乙基）对苯二甲酰胺通过傅里叶变换红外和核磁共振表征方法得到证实，可以很容易地从溶剂中分离和回收。最后，讨论了降解机制。