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Co(acac) 2 ‐Mediated Radical Polymerization of Acrylonitrile: Control Over Molecular Weights and Copolymerization With Methyl Methacrylate
Author(s) -
Buchmeiser Michael R.,
Marino Michael G.
Publication year - 2012
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201100358
Subject(s) - acrylonitrile , copolymer , branching (polymer chemistry) , methyl methacrylate , polymer chemistry , materials science , polymerization , cobalt , radical polymerization , polymer , composite material , metallurgy
The cobalt‐mediated radical polymerization of acrylonitrile in DMSO using cobalt (II) acetylacetonate [Co(acac) 2 ] as mediator is studied. Both the evolution of molecular weight and conversion over time under various conditions are monitored. Molecular weights increase sharply at the beginning of the reaction and subsequently grow linearly with conversion. No branching of the polymer is observed by 13 C NMR. By a careful design of the reaction parameters, number‐average molecular weights >1.2 · 10 5 g · mol −1 with a PDI around 2.4 together with conversions of up to 90% within 24 h are achieved. The copolymerization parameters of acrylonitrile with methyl methacrylate in DMSO at 30 °C are determined using the Kelen‐Tüdõs approach giving r AN = 0.33, r MMA = 0.71.