2003 | OriginalPaper | Buchkapitel
In Situ NMR Monitoring of Living Radical Polymerization
Reaction Kinetics and Catalyst Evolution
verfasst von : Sébastien Perrier, David M. Haddleton
Erschienen in: In Situ Spectroscopy of Monomer and Polymer Synthesis
Verlag: Springer US
Enthalten in: Professional Book Archive
Aktivieren Sie unsere intelligente Suche, um passende Fachinhalte oder Patente zu finden.
Wählen Sie Textabschnitte aus um mit Künstlicher Intelligenz passenden Patente zu finden. powered by
Markieren Sie Textabschnitte, um KI-gestützt weitere passende Inhalte zu finden. powered by
Copper mediated living radical polymerization has been investigated by on- line 1H NMR spectroscopy. The reaction was followed by in-situ1H NMR spectroscopy that results in accurate information on the polymerization. An example is given whereby living radical polymerizations is studied in the presence of ethylene glycol groups in monomer, initiator and solvent. Methyl ether poly (ethylene glycol) macroinitiators of various sizes are shown to initiate living polymerization of methacrylates, but exhibit poor initiator efficiency. The living radical polymerization of methyl ether poly(ethylene glycol) methacrylate macromonomers is demonstrated and the unusual high rate of polymerization observed is compared to that of the polymerizations with ethylene glycol containing macroinitiators. The 1H NMR study of the catalyst complex in the presence of ethylene glycol groups leads us to conclude that there is possible competitive co-ordination at the copper between ligand and ethylene glycol groups. This influences the Cu(I) / Cu(II) equilibrium, resulting in the high observed polymerization rate.