polyurethane catalyst pmdeta’s role in improving adhesion in structural polyurethane systems abstract: polyurethane (pu) systems are widely employed in structural applications due to their versatile properties, including high strength, durability, and tailorability. adhesion is a critical factor influencing the performance and longevity of structural pu components. pentamethyldiethylenetriamine (pmdeta) is a tertiary amine catalyst commonly used...