| Title |
Chemical recycling of industrial poly(ethylene terephthalate) waste: synthesis of aromatic polyester polyols, their properties and use / |
| Translation of Title |
Polietilentereftalato gamybinių atliekų cheminis perdirbimas: aromatinių poliesterpoliolių sintezė, savybės ir panaudojimas. |
| Authors |
Vitkauskienė, Irena |
| Full Text |
|
| Pages |
29 |
| Keywords [eng] |
PET waste ; transestrification ; glycolisys ; polyurethane ; foam |
| Abstract [eng] |
In this study, the generation points, reasons and properties of industrial PET waste were examined in detail. Different chemical recycling ways were suggested for each kind of industrial PET waste. Under glycolysis of industrial PET waste by ethylene glycol, the yield of the main product bis(2-hidroxyethylene) terephthalate was higher than 85 %. Several series of aromatic polyester polyols (APP) were synthesized by transesterification of industrial PET waste using diethyleneglycol (DEG) in the presence of functional additives glycerol (GL) or/and adipic acid (ADA). The effect of functional additives on transesterification process and viscosity of APP was thoroughly studied and mathematically described for the first time. APP synthesized by transesterification of industrial PET waste using DEG in the presence of ADA and/or GL fragments, had lower crystallinity and were much more stable during storage at room temperature. Viscosity of APP slightly depended on the catalyst type and its concentration. Polyurethane-polyisocyanurate (PU-PIR) foams were produced under the reaction of APP and an excess of diisocyanate. PU-PIR foams based on PET-waste-derived APP containing fragments of GL or/and ADA were characterized by excellent physical-mechanical properties, high thermal stability, low heat release and smoke production. The burning test confirmed that PU-PIR foams satisfied the requirements for class E of construction products and building elements. |
| Type |
Summaries of doctoral thesis |
| Language |
English |
| Publication date |
2011 |
