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Glycolysis of poly(ethylene terephthalate) waste with diethyleneglycol under microwave irradiation and ZnSO4·7H2O catalyst

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Abstract

The glycolysis of poly(ethylene terephthalate) (PET) by diethyleneglycol (DEG) in the presence of acetate catalyst usually produces a dark color product. Various catalysts have been used, but only ZnSO4·7H2O gives a bright yellowish liquid material. In addition, after the reaction the catalyst ZnSO4·7H2O can be separated easily and reused. Under microwave irradiation, the PET glycolysis is more efficient in time, conversion, and color improvement. The reaction mixture was purified by treatment with 20% sodium chloride solution. The structure of the isolated products was confirmed by FTIR, NMR, and HPLC-MS. Condensate of the volatile material from the glycolysis reaction was also isolated and analyzed by GC-MS. The mechanisms of PET degradation by DEG and side product formation were proposed. The transesterification of PET with excess DEG was strongly competed by the degradation of DEG to form dioxane and acetaldehyde as main volatile side products and by ether formation; therefore, the using of excessive DEG was unfavorable for the PET glycolysis.

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Acknowledgements

This research is funded by Vietnam National University HoChiMinh City (VNU-HCM) under Grant Number 562-2018-18-02.

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Authors and Affiliations

  1. Department of Polymer Chemistry, University of Science, VNU-HCM, 227 Nguyen Van Cu, District 5, HoChiMinh City, Vietnam

    Cuong N. Hoang

  2. Department of Polymer and Composite Materials, University of Science, VNU-HCM, 227 Nguyen Van Cu, District 5, HoChiMinh City, Vietnam

    Thuyen T. N. Le & Quy D. Hoang

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  1. Cuong N. Hoang
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  2. Thuyen T. N. Le
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Correspondence to Cuong N. Hoang or Quy D. Hoang.

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Hoang, C.N., Le, T.T.N. & Hoang, Q.D. Glycolysis of poly(ethylene terephthalate) waste with diethyleneglycol under microwave irradiation and ZnSO4·7H2O catalyst. Polym. Bull. 76, 23–34 (2019). https://doi.org/10.1007/s00289-018-2369-z

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  • DOI: https://doi.org/10.1007/s00289-018-2369-z

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