polyurethane amine catalyst pmdeta (pc5): a comprehensive analysis of its strong blowing effect in polyurethane foam formulation abstract: pentamethyldiethylenetriamine (pmdeta), commonly known as pc5, is a tertiary amine catalyst widely employed in the production of polyurethane (pu) foams. its strong blowing effect, stemming from its preferential catalysis of the water-isocyanate reaction, contributes significantly to foam...