synergistic co-catalysis of polyurethane amine catalysts in case applications: a comprehensive review abstract: polyurethane (pu) coatings, adhesives, sealants, and elastomers (case) are widely used materials due to their versatility and excellent performance characteristics. amine catalysts play a crucial role in the polyurethane reaction, influencing curing speed, crosslinking density, and ultimately, the final properties of the...