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Analysis of living tert ‐butyl methacrylate oligoanions in tetrahydrofuran by NMR spectroscopy, viscosity and light scattering
Author(s) -
Zune C.,
Dubois Ph.,
Grandjean J.,
Jérôme R.
Publication year - 1999
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19990301)200:3<562::aid-macp562>3.0.co;2-4
Subject(s) - monomer , chemistry , methacrylate , tetrahydrofuran , polymer chemistry , nuclear magnetic resonance spectroscopy , spectroscopy , hydrolysis , dynamic light scattering , carbon 13 nmr , methyl methacrylate , polymer , organic chemistry , materials science , physics , quantum mechanics , solvent , nanoparticle , nanotechnology
Previous kinetic studies concluded on the aggregation of the anionic chain ends of living tert ‐butyl methacrylate oligomers [PtBMA – , Li + ] in THF at low temperature. This aggregation has been confirmed by viscosimetry, light scattering and gradient field NMR techniques in a range of temperature from 253 K to 298 K. These techniques have been systematically used for the analysis of both the living oligomers and the same chains recovered after hydrolysis of the anionic end groups. The structure of the growing anionic species was analyzed by means of 13 C and 7 Li NMR spectroscopy. 13 C NMR required the selective labeling of the last monomer units by 13 C atoms.