Tetramethylimidazolidinediylpropylamine (TMBPA): A Powerful Catalyst for Accelerating Polyurethane Rigid Foam Expansion Introduction Polyurethane (PU) rigid foams are widely used in various applications, including thermal insulation, structural support, and cushioning, due to their excellent thermal insulation properties, high strength-to-weight ratio, and versatility. The manufacturing process of PU rigid foams involves a complex chemical reaction between polyols...