Degradation of Poly(butylene terephthalate) in Different Supercritical Alcohol Solvents

作者：Yang, Junhe; Huang, Jie^*; Chyu, Minking K.; Wang, Qing-Ming; Xiong, Danliu; Zhu, Zibin

来源：Journal of Applied Polymer Science, 2010, 116(4): 2269-2274.

DOI：10.1002/app.31649

• degradation
• monomers
• recycling

Reactions were carried out in a batch autoclave reactor. Poly(butylene terephthalate) (PBT) and different alcohol solvents were used in the vessel. The reaction products were analyzed by infrared spectroscopy and gas chromatography/mass spectrometry. Alcoholysis of PBT occurred in supercritical methanol, ethanol, and propanol, and we obtained dimethyl terephthalate (DMT), diethyl terephthalate (DET), and dipropyl terephthalate (DPT), respectively. The conversion of PBT at different temperatures showed similar trends but different degradation degrees. The reactivity for the alcoholysis of PBT in supercritical methanol was much higher than those in supercritical ethanol and propanol. DMT and 1,4-butanediol obtained from the depolymerization of PBT in supercritical methanol reached 98.5 and 72.3%, respectively, at 583 K for 75 min. The yield of DET reached 76% for 75 min.

• 出版日期2010-5-15
• 单位上海理工大学; 华东理工大学