The Catalytic Role of 2-Ethyl-4-Methylimidazole in Polyurethane Foam Formation Abstract: 2-Ethyl-4-methylimidazole (EMI) is a tertiary amine catalyst widely employed in the production of polyurethane (PU) foams. This article provides a comprehensive review of EMI’s role in catalyzing the complex chemical reactions involved in PU foam formation, including its influence on gelation, blowing, and overall foam...