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- Title
Radiation polymerization of methacrylates controlled by a chain transfer catalyst.
- Authors
Roshchupkin, V.; Berezin, M.; Kiryukhin, D.
- Abstract
The effect of γ-radiation dose and chain transfer catalyst on polymerization of methyl methacrylate (MMA) and copolymerization of MMA with hydroxyethyl methacrylate or triethylene glycol dimethacrylate has been investigated. The addition of 5 × 10−10 mol/L of bis[(difluoroboryl) isopropylpyridine dimethylglyoximato]cobalt(II) (Co(II)) makes it possible to produce macromonomers MM bearing terminal double bonds and having a degree polymerization of n = 2−40 and a polydispersity index of 1.05−1.15. It has been found that the degree polymerization of the macromonomers increases with the increasing γ-radiation dose and monomer conversion through the mechanism of the reversible β-cleavage of the terminal unit: R + MM ↔ MM + R followed by the living polymerization of both radicals. This reaction may compete with the catalytic chain transfer reaction and have a significant effect on the evolution of the molecular weight characteristics of the macromonomers during the course of MMA (co)polymerization.
- Subjects
POLYMERIZATION; METHACRYLATES; CHAIN transfer (Chemistry); CATALYSTS; POLYMETHYLMETHACRYLATE; DOUBLE bonds
- Publication
High Energy Chemistry, 2017, Vol 51, Issue 2, p87
- ISSN
0018-1439
- Publication type
Article
- DOI
10.1134/S0018143917010106