Mechanistic studies of methyl methacrylate polymerization in the presence of cobalt complex with sterically-hindered redox-active ligand

The influence of bis[4,6-di- tert -butyl- N -(2,6-dimethylphenyl)- o -iminobenzosemiquinono]cobalt (II) on radical polymerization of methyl methacrylate initiated by AIBN at 70–90 °C was studied. The introduction of cobalt complex bearing redox ligands into reaction media allows to provide polymeriz...

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Published in:Journal of polymer research 2016-11, Vol.23 (11), p.1, Article 222
Main Authors: Kolyakina, Elena V., Grishin, Ivan D., Poddel’sky, Andrey I., Grishin, Dmitry F.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Industrial Chemistry/Chemical Engineering
Original Paper
Polymer Sciences
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creator Kolyakina, Elena V.
Grishin, Ivan D.
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description The influence of bis[4,6-di- tert -butyl- N -(2,6-dimethylphenyl)- o -iminobenzosemiquinono]cobalt (II) on radical polymerization of methyl methacrylate initiated by AIBN at 70–90 °C was studied. The introduction of cobalt complex bearing redox ligands into reaction media allows to provide polymerization of methyl methacrylate without self-acceleration with linear increase of molecular weight with conversion giving polymers with relatively low molecular weight distribution. The results of IR and NMR spectrometry and MALDI mass spectroscopy measurements show that the possibility of β-hydrogen transfer between complex and propagating radical during polymerization is minimal. The electron donating additives as tert .-butyl amine and pyridine have no activating effect on polymerization. The results of our experiments provided at different concentrations of initiator show that polymerization proceeds via degenerative chain transfer mechanism.
doi_str_mv 10.1007/s10965-016-1114-2
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subjects Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Industrial Chemistry/Chemical Engineering
Original Paper
Polymer Sciences
title Mechanistic studies of methyl methacrylate polymerization in the presence of cobalt complex with sterically-hindered redox-active ligand
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