Abstract
Article history: Received February 08, 2012 Received in Revised form Feb 19, 2011 Accepted 10 March 2011 Available online 31 March 2012 The aminolytic depolymerization of PET bottle waste with ethanolamine by conventional heating and microwave irradiation heating method was attempted with heterogeneous, recyclable acid catalysts such as beta zeolite (SiO2/ AlO2= 15 Naform) and montmorillonite KSF. The pure product bis-(2-hydroxyethyl) terephthalamide (BHETA) of aminolysis was obtained in good yield (8588%). The BHETA, thus obtained, was subjected to cyclization reaction by heating with polyphosphoric acid as well as by chlorination (using phosphoryl chloride), bromination (using red phosphorous and liquid bromine) and nitration (conc. HNO3 + conc. H2SO4) followed by conventional and microwave irradiation heating in N,Ndimethyl formamide/ potassium carbonate solution. The product so obtained was 2, 2’-(1,4-phenylene)– bis-(2-oxazoline) (PBO), which has applications in polymer synthesis as a chain extender/ chain coupling agent or a cross linker. The productswere analyzed by FTIR, DSC, Mass and NMR (1H and 13C NMR). © 2012 Growing Science Ltd. All rights reserved.
Highlights
Recent global concerns about environment are focused on development of recycling technologies for waste plastics[1]
The depolymerization conditions have been optimized through various parameters such as aminolysis time, catalyst concentration, PET: ethanolamine ratio to get maximum possible yield of pure product
When the aminolysis was carried out under microwave heating, the time required for similar yields (86- 88 %) of bis-(2-hydroxyethyl) terephthalamide (BHETA) was as low as 5- 6 min
Summary
Recent global concerns about environment are focused on development of recycling technologies for waste plastics[1]. (ethylene terephthalate) (PET) is one of the versatile engineering plastics with excellent thermal and mechanical properties. It is semi-crystalline, non- toxic polyester with high strength and transparency, by virtue of which large quantities are used in the manufacture of food packaging and especially of soft drink bottles. The substantial contribution of PET in solid waste generation and its high resistance to degradative assimilation into the environment labels it as a noxious material. Recycling of PET contributes to the conservation of raw petrochemical products and of energy to the tune of 50– 60 % as compared to making the same product from virgin resin. Solvolytic chain cleavage of PET is possible by reagents, such as water (hydrolysis), alcohols (alcoholysis), amines (aminolysis), acids (acidolysis) leading to a large variety of valuable products 2
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