AN EFFECTIVE METHOD TO SYNTHESIZE LIQUID POLYESTER POLYOLS FROM WASTE POLYETHYLENE TEREPHTHALATE
발표자
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초록
내용
This study describes an effective accessible method for producing low molecular weight liquid polyol from waste polyethylene terephthalate (PET) plastic. Waste PET was degraded in the presence of Zn2+ catalysts utilizing diethylene glycol (DEG) to form a glycolytic mixture. Ethylenediaminetetraacetic acid (EDTA) was introduced as a catalytic deactivator followed by excess diols removal under reduced pressure. Based on the GPC chromatogram results, it was confirmed that EDTA was effectively used as a metal chelating agent. Therefore, it is possible to obtain a liquid polyol having desired properties by preventing catalyst polymerization during diol recovery and controlling a narrow molecular weight distribution and dynamic viscosity of the final product. Following that, the reaction of the synthesized polyol as soft segments and 4,4’-methylene-bis(phenyl isocyanate) resulted in a thermoplastic polyurethane with good thermal stability and mechanical properties.