Chemical Recycling of Rigid Polyurethane Foam Scrap via Base Catalyzed Aminolysis
Keywords:
aminolysis, 4,4′-methylenedianiline, polyurethane, chemical recyclingAbstract
Rigid polyurethane foam scrap was depolymerized by aminolysis using diethylenetriamine (DETA) as a degrading agent and sodium hydroxide (NaOH) as both a reactant and catalyst. The reaction was done at 180oC for 70 minutes and yielded 4,4′-methylenedianiline (MDA). It was found that higher completion of depolymerization increased as the amount of NaOH increased. In contrast, the amount of MDA decreased due to the aminolysis of PU foam by MDA catalyzed with NaOH.
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