Evaluation of Poly(ethylene-terephthalate) Products of Chemical Recycling by Differential Scanning Calorimetry |
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| Authors: | Ljerka Kratofil Krehula Zlata Hrnjak-Murgić Jasenka Jelenčić Branka Andričić |
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| Institution: | (1) Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, P.O. Box 177, 10000 Zagreb, Croatia;(2) Faculty of Chemical Technology, University of Split, Teslina10/V, 21000 Split, Croatia |
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| Abstract: | Poly (ethylene-terephthalate), (PET) bottles waste was chemically recycled by glycolysis and hydrolysis. The depolymerization
processes were carried out in different time intervals from 5 to 360 min, in two different molar ratios of PET/EG, 1:5 and
1:18 and at different temperatures. The PET glycolysis leads to formation of bis(2-hydroxy-ethyl)terephthalate (BHET) monomer
and PET oligomers with hydroxyl and carboxyl end groups while PET hydrolysis is followed by formation of monomers terephthalic
acid (TPA) and ethylene glycol (EG). Fractions of monomers and oligomers were further characterized by FTIR spectroscopy and
by differential scanning calorimetry (DSC). The results show that DSC is successful method to describe the different structures
of oligomers formed during chemical recycling of PET. |
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| Keywords: | Chemical recycling Differential scanning calorimetry (DSC) Poly (ethylene-terephthalate) (PET) Polymer waste |
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