In situ formation of yttrium alkoxides: A versatile and efficient catalyst for the ROP of epsilon-caprolactone

Martin, Eric; Dubois, Philippe; Jérôme, Robert

doi:10.1021/ma034236+

Reference : In situ formation of yttrium alkoxides: A versatile and efficient catalyst for the RO...


	Document type :	Scientific journals : Article
	Discipline(s) :	Engineering, computing & technology : Materials science & engineering Physical, chemical, mathematical & earth Sciences : Chemistry
	To cite this reference:	http://hdl.handle.net/2268/4363

Title :	In situ formation of yttrium alkoxides: A versatile and efficient catalyst for the ROP of epsilon-caprolactone
Language :	English
Author, co-author :	Martin, Eric [Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Dubois, Philippe [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) > >]
Publication date :	12-Aug-2003
Journal title :	Macromolecules
Publisher :	Amer Chemical Soc
Volume :	38
Issue/season :	16
Pages :	5934-5941
Peer reviewed :	Yes (verified by ORBi)
Audience :	International
ISSN :	0024-9297
City :	Washington
Keywords :	[en] ring-opening polymerization (ROP) ; lactone
Abstract :	[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.
Research centres :	Center for Education and Research on Macromolecules (CERM)
Funders :	Omnichem, Louvain-la-Neuve, Belgium ; Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/4363
DOI :	10.1021/ma034236+
Other URL :	http://pubs.acs.org/doi/pdf/10.1021/ma034236%2B

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