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...