ORBi: Wang Jin-Shan - Anionic polymerization of acrylic monomers. 10. 13C and 7Li NMR studies on the monomeric model of living poly(methyl)methacrylate)

Reference : Anionic polymerization of acrylic monomers. 10. 13C and 7Li NMR studies on the monomeric...


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Chemistry Engineering, computing & technology : Materials science & engineering
	To cite this reference:	http://hdl.handle.net/2268/16012

Title :	Anionic polymerization of acrylic monomers. 10. 13C and 7Li NMR studies on the monomeric model of living poly(methyl)methacrylate)
Language :	English
Author, co-author :	Wang, Jin-Shan [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Jérôme, Robert [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Warin, R. [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Teyssié, Philippe [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Publication date :	15-Mar-1993
Journal title :	Macromolecules
Publisher :	American Chemical Society
Volume :	26
Issue/season :	6
Pages :	1402-1406
Audience :	International
ISSN :	0024-9297
City :	Washington
Country :	DC
Keywords :	[en] anionic polymerization ; (meth)acrylate
Abstract :	[en] A monomeric model structurally comparable to the active end of a living poly(methyl methacrylate) (PMMA), i.e., a methyl α-lithioisobutyrate (MIBLi)/THF solution, was studied by both Li-7 and C-13 NMR. It has been shown that two different coordination aggregates exist in a MEBLi/THF solution. That situation corresponds to a slow exchange process between tetramer and dimer, i.e. the later being favored by a decrease in temperature or concentration. Such an equilibrium is characterized with ΔH = -2.1 kcal/mol and ΔS = -13.7 cal/mol.K by means of Li-7 NMR. Again, C-13 NMR results obtained suggest that a MIBLi/THF solution displays a charge-delocalized character, which is different from a O-Li-bonded bonded structure in solid state established by crystal analyses of several similar ester enolates.
Research units :	Center for Education and Research on Macromolecules (CERM)
Funders :	Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/16012
DOI :	10.1021/ma00058a032
Other URL :	http://pubs.acs.org/doi/pdf/10.1021/ma00058a032

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