Synergistic Catalysis of Amine Polyurethane Gel Catalysts with Tin Catalysts in Polyurethane Systems Design Abstract: This article explores the synergistic effects of amine polyurethane gel catalysts (APGCs) and tin catalysts in the design and optimization of polyurethane (PU) systems. Traditional PU catalysis often relies on either tin catalysts, known for promoting the urethane (gelation) reaction,...