2-Ethyl-4-Methylimidazole: A Versatile Co-Catalyst in Polyurethane Synthesis Abstract: Polyurethane (PU) synthesis is a complex chemical process heavily reliant on catalytic activity to achieve desired reaction rates, molecular weights, and ultimately, material properties. While tertiary amine and organometallic catalysts are commonly employed, the utilization of imidazole derivatives, particularly 2-ethyl-4-methylimidazole (2E4MI), as co-catalysts is gaining significant traction....