enhancing reaction selectivity with trimethylaminoethyl piperazine amine catalyst in rigid foam manufacturing 📚 abstract rigid polyurethane (pu) foams are widely used in insulation, construction, and packaging due to their excellent thermal insulation properties, lightweight nature, and cost-effectiveness. the manufacturing process involves a complex interplay of reactions, primarily the urethane (polymerization) and blowing (expansion) reactions. achieving...