Effect of Curing Time on the Properties of Non-Isocyanate Polyurethane Adhesives Derived from Waste Soybean Oil
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Non-isocyanate polyurethanes (NIPUs) derived from biobased amines and polycarbonates provide a sustainable alternative to conventional polyurethanes. This study explores the development of eco-friendly polyurethane elastomers as adhesives by employing various amines and optimizing curing times. Model adhesives were formulated using equimolar carbonate/amine ratios of carbonated waste soybean oil and different amines, including ethylenediamine, butylenediamine, hexamethylenediamine, dodecanediamine, m-xylylenediamine, tris(2-aminoethyl)amine, and melamine under mild reaction conditions. The optimal curing time for each NIPU adhesive was determined, and their mechanical and adhesion properties were assessed. Among the samples, the NIPU prepared with tris(2-aminoethyl)amine and a curing time of 12h exhibited the highest lap shear strength of 13.7 MPa.