Synthesis of linear block copolymers from methacrylic monomers using 4,6-di- tert -butyl- N -2,6-diisopropylphenyl)- o -
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Russian Chemical Bulletin, International Edition, Vol. 69, No. 8, pp. 1478—1485, August, 2020
Synthesis of linear block copolymers from methacrylic monomers using 4,6-di-tert-butyl-N-(2,6-diisopropylphenyl)-o-iminobenzoquinone O. S. Lizyakina,a L. B. Vaganova,a A. V. Piskunov,b and D. F. Grishina aN.
I. Lobachevsky State University of Nizhny Novgorod, 23 prosp. Gagarina, 603950 Nizhny Novgorod, Russian Federation. Fax: +7 (831) 462 3220. E-mail: [email protected] bG. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 ul. Tropinina, 603950 Nizhny Novgorod, Russian Federation. Fax: +7 (831) 462 7497. E-mail: [email protected] Polymers based on methacrylic monomers were synthesized using 4,6-di-tert-butyl-N-(2,6diisopropylphenyl)-o-iminobenzoquinone. They can be used for the directed synthesis of linear block copolymers with various compositions in the wide range of molecular weights under conditions of the polymerization according to the mechanism of reversible inhibition. It has been demonstrated that a structure of monomer plays the key role in the synthesis of block copolymers with relatively low values of the polydispersity coefficient. The optimal conditions for the synthesis of linear block copolymers based on methacrylic structures monomers have been revealed. Key words: methacrylates, o-iminobenzoquinone, block copolymers, reversible inhibition.
Synthetic copolymers are critically important components of modern hardware materials.1 At this end, copolymers containing two or more units in their composition are of particular interest. The presence of few types of the monomer units in a macromolecule provides ample opportunities to vary physicochemical properties of the polymeric materials.2 In order to attain the required properties to polymer products, it is necessary in many cases to maintain not only a certain ratio of the monomers, but also a certain order of their coupling in macromolecules. A controlled mode of the polymerization allows one to synthesize not only homopolymers with a given molecular weight (MW) and low polydispersity, but also copolymers of various structures.3,4 Depending on the type of used regulators, it is possible to obtain copolymers with tunable compositional heterogeneity (random, gradient, etc.) and topology (linear, branched, star-shaped, etc.). Linear block copolymers are of greatest interest in the context of opportunities to control the complex of properties and characteristics. They are usually synthesized via a sequential polymerization of the monomers of various structures, including methacrylates. It is known5 that esters of methacrylic acid are successfully employed as the components of various glues and adhesives, solvents for varnish-and-paint and enamel coatings, organic glasses for aviation and mechanical engineering industry, construction, and household items. They are also widely used in modern dentistry and medicine.
Many methods and approaches to synthesize block copolymers in the controlled mode are known, including reversible
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