[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 center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry Materials science & engineering
Author, co-author :
Wang, Jin-Shan; 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)
Warin, R.; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Teyssié, Philippe ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
Anionic polymerization of acrylic monomers. 10. 13C and 7Li NMR studies on the monomeric model of living poly(methyl)methacrylate)
Publication date :
15 March 1993
Journal title :
Macromolecules
ISSN :
0024-9297
eISSN :
1520-5835
Publisher :
American Chemical Society, Washington, United States - District of Columbia
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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