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From Molecule to Material: How Support Changes Heterobimetallic Catalysts in Lactide Polymerization
Fan Yang1, Yahaya Nasiru2, Abdulrahman Adamu Isah2
1Chimie ParisTech, PSL University, CNRS, Institut de Recherche de Chimie Paris, Paris, France.
Abstract:
Sustainable production of polylactide demands catalysts that are both recoverable and capable of delivering precise molar mass and stereocontrol. A series of heterobimetallic complexes [(THF)NaFe(OtBu)3]2, [(THF)2KFe(OtBu)3]2, [KZn(OtBu)3]2, [(THF)KCu(OtBu)3]∞ and [(THF)KCo(OtBu)3]2 was evaluated as precursors for heterogeneous catalysts by grafting onto dehydroxylated silica. All complexes demonstrated activity in the ring-opening polymerization of lactide. Notably, the silica-supported [(THF)KFe(OtBu)2]/SiO2-700 and [(THF)NaFe(OtBu)2]/SiO2-700 systems exhibited high efficiency, promising recyclability, and afforded predictable molar masses (Mn,exp close to Mn,th) with narrow dispersities. These findings highlight new opportunities for designing recyclable catalysts for sustainable PLA synthesis.
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