Reference : Controlled ring-opening polymerization of epsilon-caprolactone promoted by "in situ" ...
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/4172
Controlled ring-opening polymerization of epsilon-caprolactone promoted by "in situ" formed yttrium alkoxides
English
Martin, Eric [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Dubois, Philippe [University of Mons-Hainaut (UMH) > > Laboratory of Polymeric and Composite Materials (SMPC) > >]
Jérôme, Robert mailto [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
7-Mar-2000
Macromolecules
Amer Chemical Soc
33
5
1530-1535
Yes (verified by ORBi)
International
0024-9297
Washington
[en] ring-opening polymerization (ROP) ; lactone
[en] The ring-opening polymerization of ε-caprolactone has been initiated by [tris(hexamethyldisilyl)amide]yttrium in the presence of an excess of 2-propanol. This initiating system is very active even at high alcohol-to-Y molar ratio. Polymers with controlled molecular parameters (Mn, end groups) and low dispersity are formed as result of fast alkoxide/alcohol exchange. At molar excess of 2-propanol higher than 100, this exchange is no longer quantitative. The in situ formed active species involved in this new initiating system are different from those ones present in the commercial yttrium oxo-isopropoxide Y5(μ-O)(OiPr)13 cluster. Evidence is provided by 1H NMR spectroscopy.
Center for Education and Research on Macromolecules (CERM)
Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy
Researchers
http://hdl.handle.net/2268/4172
10.1021/ma991045r
http://pubs.acs.org/doi/pdf/10.1021/ma991045r

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