Skip to main content
Polymerization of Ethylene Terephthalate Cyclic Oligomers with Antimony Trioxide
Macromolecules (2000)
  • William MacKnight, University of Massachusetts Amherst
  • Ji Ho Youk
  • Roger P. Kambour
Conditions for polymerizing ethylene terephthalate cyclic oligomers (ETCs) with the catalyst antimony trioxide were investigated with the ultimate goal in mind of using ETCs to produce high­performance poly(ethylene terephthalate) {PET) composites. The ETCs used were prepared both by a direct synthesis method and by cyclodepolymerization (CDP) in dilute solution. ETCs prepared exhibited a distribution of oligomeric species displaying a broad me􀀴ting range, the uppermost end of which lies at 290 °C. In the case of ETCs prepared by CDP, purified ETCs (p-ETCs) were prepared by eliminating remaining impurities including linear oligomers and cyclic oligomers containing the diethylene glycol (DEG) unit using dichloromethane and tetrahydrofuran. A homogeneous mixture of ETCs prepared by the direct synthesis method or p-ETCs with antimony trioxide was successfully polymerized to high molecular weight (MW) PET (Mn 2:: 25 000) at 293 °C within 15 min. The lower the contents of remaining impurities, the higher the MW of the resultant PET. The PET of highest MW (Mn= 32 000) was obtained from polymerization ofp-ETCs with bismuth trioxide at 293 °C for 15 min. PET polymerized from p-ETCs showed the same thermal behavior as did the commercial one. In this research, a useful method of PET recycle by using ETCs was successfully established. 
  • Polymerization,
  • Ethylene Terephthalate,
  • Cyclic Oligomers,
  • Antimony Trioxide
Publication Date
Citation Information
William MacKnight, Ji Ho Youk and Roger P. Kambour. "Polymerization of Ethylene Terephthalate Cyclic Oligomers with Antimony Trioxide" Macromolecules Iss. 33 (2000) p. 3594 - 3599
Available at: