1. Pentamethyldiethylenetriamine PC-5: The star of environmentally friendly polyurethane catalyst On the stage of the chemical industry, the catalyst is like a director with outstanding skills, quietly controlling the reaction process, pushing the originally slow or even difficult chemical reaction to a climax. Among these many catalysts, Pentamethyl Diethylenetriamine PC-5 (Pentamethylenenetriamine PC-5) stands out for...