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

Wang, Jin-Shan; Jérôme, Robert; Warin, R.; Teyssié, Philippe

doi:10.1021/ma00058a032

Article (Scientific journals)

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

Wang, Jin-Shan; Jérôme, Robert; Warin, R. et al.

1993 • In Macromolecules, 26 (6), p. 1402-1406

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/16012

DOI
10.1021/ma00058a032

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Keywords :

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 Center/Unit :

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

Volume :

Issue :

Pages :

1402-1406

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://pubs.acs.org/doi/pdf/10.1021/ma00058a032

Funders :

BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
F.R.S.-FNRS - Fonds de la Recherche Scientifique

Available on ORBi :

since 02 July 2009

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