Reference : Preparation of supported yttrium alkoxides as catalysts for the polymerization of lac...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/4366
Preparation of supported yttrium alkoxides as catalysts for the polymerization of lactones and oxirane
English
Martin, Eric [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Dubois, Philippe [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Jérôme, Robert mailto [Universisty of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
15-Feb-2003
Journal of Polymer Science. Part A, Polymer Chemistry
Wiley
41
4
569-578
Yes (verified by ORBi)
International
0887-624X
1099-0518
Hoboken
[en] ring-opening polymerization (ROP) ; lactone
[en] Two methods have been reported that allow yttrium alkoxides to be supported on porous silica and to be used afterward as heterogeneous catalysts in the ring-opening polymerization of oxirane and e-caprolactone. In the two methods, [tris(hexamethyldisilyl)-amide]yttrium [Y[N(SiMe3)(2)](3)} is the metal alkoxide precursor. It is directly reacted with the silanol groups of the support, in the first method, and this is followed by alcoholysis of the unreacted amide groups. The flexibility of this method seems to be limited because the grafting density and the structure of the grafted Y alkoxide (less than one alkoxide by metal) are independent of the experimental conditions. In the second method, Y[N(SiMe3)(2)](3) is first reacted with 1 or 2 equiv of alcohol with the formation of the mixed Y alkoxide/amide. The amide functions are used to attach Y to the support. This method is free from side reactions, quite reproducible, and well suited to support one type of active species (monoalkoxide or dialkoxide). Preliminary experiments with e-caprolactone polymerization have confirmed the activity of the supported Y alkoxide, whatever preparation method is used. (C) 2003 Wiley Periodicals, Inc.
Center for Education and Research on Macromolecules (CERM)
Omnichem, Louvain-la-Neuve, Belgium ; Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy
Researchers
http://hdl.handle.net/2268/4366
10.1002/pola.10608
http://www3.interscience.wiley.com/cgi-bin/fulltext/102521731/PDFSTART

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