2-Propylimidazole: A Versatile Catalyst and Blowing Agent Synergist in Polyurethane Foam Production Abstract: 2-Propylimidazole (2-PI) is emerging as a significant component in polyurethane (PU) foam formulations, acting not only as a catalyst for the isocyanate-polyol reaction but also as a synergist for chemical blowing agents. This article provides a comprehensive overview of the role of...