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Abstract

Polyethylene terephthalate (PET) wastes were depolymerized using 1,4-butanediol (BD) and triethylene glycol (TEG) in the presence of zinc acetate as a transesterification catalyst. The glycolyzed products were analyzed for hydroxyl and acid values and identified by elemental analysis, GPC, ¹H NMR, ¹³C NMR, differential scanning calorimeter (DSC) and mass spectra techniques.

It was found that the glycolyzed products consist mainly of bis-(hydroxybutyl terephthalate) monomer and dimer by using 1,4-butanediol. The depolymerization using TEG resulted in products of TEG-(TPA- TEG)_n for n = 1−3. All glycolyzed products had a low acid value indicating the presence of a minor fraction of terephthalate oligoesters.

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Depolymerization of Poly(ethylene terephthalate) Waste Using 1,4-Butanediol and Triethylene Glycol

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