Depolymerization of poly(ethylene terephthalate) resin under pressure
Article first published online: 10 MAR 2003
Copyright © 1991 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 42, Issue 6, pages 1501–1507, 20 March 1991
How to Cite
Chen, J. Y., Ou, C. F., Hu, Y. C. and Lin, C. C. (1991), Depolymerization of poly(ethylene terephthalate) resin under pressure. J. Appl. Polym. Sci., 42: 1501–1507. doi: 10.1002/app.1991.070420603
- Issue published online: 10 MAR 2003
- Article first published online: 10 MAR 2003
- Manuscript Received: 16 NOV 1990
- Manuscript Accepted: 9 JUL 1990
The process of depolymerization of PET resin by EG glycolysis under pressure is investigated. The kinetics of this pressurized depolymerization of PET resin is discussed. It was found that the rate of depolymerization is dependent of temperature, pressure, and concentration ratio of EG to PET. The rate of depolymerization is proportional to the square of EG concentration and faster than that under atmospheric pressure. Glycolyzed products under pressure consist of the PET monomer, BHET, and oligomers, mostly dimer and trimer. An equilibrium between BHET and oligomers is attained quickly soon after the depolymerization step is completed in the case of a higher ratio of EG/PET used. In the case of lower ratio of EG/PET, the final product now consists of higher molecular weight of oligomers rather than monomer, dimer, and trimer.