Investigation of methyl methacrylate and vinyl acetate polymerization promoted by Al(iBu)3/2,2'-bipyridine and Al(iBu)3/2,2'-bipyridine/TEMPO complexes
[en] Results of methyl methacrylate (MMA) and vinyl acetate (VOAc) polymerization using the Al(iBu)3/2,2‘-bipyridine/TEMPO initiating system at room temperature failed to confirm the “living” radical mechanism reported earlier. Several species apparently propagate without control in a normal free radical process and only above a critical initiator concentration. No evidence was found for the penta- and hexacoordinated aluminum species previously suggested, but high conversion to an alkoxyamine was observed. Additionally, mixing Al(iBu)3 and BIPY promotes a variety of reactions involving alkyl and hydride transfers to the aromatic rings forming reduced BIPY products, along with a persistent organoaluminum radical. All these results illustrate that the process is considerably more complicated than postulated before. Conversely, at −78 °C, a single active species excluding the participation of TEMPO has been put in evidence, displaying some “living” characteristics. Several experiments support its anionic nature, as previously suggested by Ikeda.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry Materials science & engineering
Author, co-author :
Granel, Claude; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Teyssié, Philippe ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Jasieczek, C. B.; University of Warwick, UK > Department of Chemistry
Shooter, A. J.; University of Warwick, UK > Department of Chemistry
Haddleton, D. M.; University of Warwick, UK > Department of Chemistry
Hastings, J. J.; University of Warwick, UK > Department of Chemistry
Gigmes, D.; Centre de Saint Jérôme, Marseille, France > Laboratoire de Structure et Réactivité des Espèces Paramagnétiques
Grimaldi, S.; Centre de Saint Jérôme, Marseille, France > Laboratoire de Structure et Réactivité des Espèces Paramagnétiques
Tordo, P.; Centre de Saint Jérôme, Marseille, France > Laboratoire de Structure et Réactivité des Espèces Paramagnétiques
Greszta, D.; Carnegie Mellon University, Pittsburgh, USA > Department of Chemistry
Matyjaszewski, K.; Carnegie Mellon University, Pittsburgh, USA > Department of Chemistry
Language :
English
Title :
Investigation of methyl methacrylate and vinyl acetate polymerization promoted by Al(iBu)3/2,2'-bipyridine and Al(iBu)3/2,2'-bipyridine/TEMPO complexes
Publication date :
20 October 1998
Journal title :
Macromolecules
ISSN :
0024-9297
eISSN :
1520-5835
Publisher :
Amer Chemical Soc, Washington, United States - Washington
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