Copper-based supported catalysts for the atom transfer radical polymerization of methyl methacrylate: How can activity and control be tuned up?

Emmanuel Duquesne, Céline Labruyère, Jean Habimana, Philippe Degée, Philippe Dubois

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Résumé

This article is aimed at revisiting the synthesis of copper-based catalysts immobilized onto crosslinked polystyrene (PS) resins carrying pyridinimine groups (PS-pyridinimine/CuBr). These supported catalytic systems were used for promoting the atom transfer radical polymerization of methyl methacrylate as initiated by ethyl2-bromoisobutyrate. It was evidenced that the control over the polymerization reaction was strongly influenced by the coordination ability and extent of the transition-metal salt on the supported pyridinimine ligands. For instance, increasing the ligand-to-cata-lyst molar ratio allowed for increasing the polymerization rate and improving the control over the molecular parameters of the synthesized poly(methyl)methacrylate (PMMA) in terms of the molar masses and molecular weight distributions. The PSpyridinimine/CuBr supported catalyst was recycled and reused for further polymerization reactions. After two recycling steps, the reaction activity appeared to be preserved, and the control was improved in terms of the initiation efficiency. However, a slight increase in the polydispersity indices was observed. Interestingly, the introduction of a flexible polydimethylsiloxane spacer between the PS support and the catalytic sites led to some more improvement of the control over the molecular parameters of PMMA chains, which displayed narrower molecular weight distributions.

langue originaleAnglais
Pages (de - à)744-756
Nombre de pages13
journalJournal of Polymer Science, Part A: Polymer Chemistry
Volume44
Numéro de publication2
Les DOIs
Etat de la publicationPublié - 15 janv. 2006
Modification externeOui

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