Reference : In situ formation of yttrium alkoxides: A versatile and efficient catalyst for the ROP o...
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/4363
In situ formation of yttrium alkoxides: A versatile and efficient catalyst for the ROP of epsilon-caprolactone
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 [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
12-Aug-2003
Macromolecules
Amer Chemical Soc
38
16
5934-5941
Yes (verified by ORBi)
International
0024-9297
Washington
[en] ring-opening polymerization (ROP) ; lactone
[en] [Tris(hexamethyldisilyl)amide] yttrium is a catalyst for the controlled ring-opening polymerization of epsilon-caprolactone when reacted with an excess of alcohol. Up to an alcohol-to-yttrium molar ratio of 50, the chain transfer to the alcohol is quantitative, and the molecular weight of the chains can be predicted from the monomer-to-alcohol molar ratio. At alcohol-to-yttrium ratios higher than 100, the alcohol is quantitatively consumed provided that 1,1,1,3,3,3-hexamethyldisilazane, which is formed as a byproduct, is removed from the reation medium. Depending on the structure of the alcohol, end-functional polyesters can be prepared (e.g., with N-pyrrolyl and 3-thienyl end groups). Well-defined block and random copolymers of epsilon-CL with lactides and gamma-bromo-epsilon-caprolactone, respectively, have also been synthesized. Compared to aluminum alkoxides, the in situ formed yttrium alkoxides have the advantage of a much faster polymerization kinetics while preserving control.
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/2268/4363
10.1021/ma034236+
http://pubs.acs.org/doi/pdf/10.1021/ma034236%2B

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Restricted access
Martin E 2003 Macromolecules 5934.pdfPublisher postprint134.72 kBRequest copy

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.