Controlled Ring-Opening Copolymerization of Epoxides and Cyclic Anhydrides Through Bifunctional Thiourea-Quaternary Ammonium Salt Catalysts

Bifunctional thiourea–quaternary ammonium salt catalysts exhibited significantly higher activity over a two-component system with a similar structure at a low catalyst loading for the ring-opening copolymerization of epoxides and cyclic anhydrides.