Synthesis of Self-Healing Polymers by Radical Controlled Polymerization
S. A. CHERKASOV1,2, M. V. EDELEVA2, S. R. A. MARQUE3,4, E. G. BAGRYANSKAYA2
1Novosibirsk State University, Novosibirsk, Russia
2Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
3Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of the Russian Academy of Sciences, Marseille, France
4UniversitГ© d'Aix - Marseille
Keywords: radical controlled polymerization, self-healing polymers, complexation, alkoxyamines, EPR, NMR
Pages: 660-667
Abstract
The formation of a complex of magnesium and 4-ethylterpiridyl-(N-tert-butyl-N-(1-diethylphosphone-2,2-dimethylpropyl))-nitroxide alkoxyamine (SG1-tpy) was investigated by means of NMR spectroscopy. The stoichiometry of the complex was determined by constructing the Job’s plot. The homolysis rate constant of the alkoxyamine used was determined by means of EPR spectroscopy, and the activation energy was estimated. Polystyrene was obtained by radical controlled polymerization, and its molecular weight characteristics were studied by gel-permeation chromatography. When magnesium trifluoroacetate is added to the polymer solution, the molecular weight of the polymer increases, which indicates the formation of the complex. Polystyrene was also synthesized using the complex form of the initiator. It is shown that all the obtained polymers are narrowly dispersed, polydispersity is less than 1.5.
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