Microwave-assisted aminolytic depolymerization of PET waste

Polyethylene terephthalate (PET) fibre waste and disposable soft drink bottle waste were subjected to depolymerization via aminolysis using excess of ethanolamine. The reaction was carried out under non conventional microwave energy in the presence of different simple chemicals as catalysts namely,...

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Bibliographic Details
Published in:European polymer journal 2009-09, Vol.45 (9), p.2695-2700
Main Authors: Pingale, N.D., Shukla, S.R.
Format: Article
Language:English
Subjects:
Aminolysis
Applied sciences
Bis (2-hydroxyethyl) terephthalamide
Exact sciences and technology
Microwave irradiation
PET waste
Polymer industry, paints, wood
Technology of polymers
Waste treatment
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Summary:Polyethylene terephthalate (PET) fibre waste and disposable soft drink bottle waste were subjected to depolymerization via aminolysis using excess of ethanolamine. The reaction was carried out under non conventional microwave energy in the presence of different simple chemicals as catalysts namely, sodium acetate, sodium bicarbonate and sodium sulphate. After repeated crystallization, pure bis (2-hydroxyethyl) terephthalamide (BHETA) was obtained with very high yields (nearly 90%). It was subjected to characterization by elemental analysis, melting point, FTIR, NMR and DSC. With the use of microwave energy, the process becomes economically viable since high yields of BHETA (>90%) at very low reaction time (4 min) could be obtained with common and cheap chemicals as catalysts.
ISSN:0014-3057
1873-1945
DOI:10.1016/j.eurpolymj.2009.05.028