С помощью радикальной полимеризации синтезировали новый фторированный полиметакрилат с перфтор- трет -гексильными группами в боковой цепи. Плёнки полимера, наносимые из растворов в сверхкритическом диоксиде углерода, позволяют получить супергидрофобные покрытия.
A new fluorinated polymethacrylate with perfluoro-tert-hexyl groups in the side chain has been prepared by radical polymerization. Polymer films applied from solutions in supercritical carbon dioxide enables the preparation of superhydrophobic coatings.
A magnetic pyrocarbon composite containing nanoparticles with an overwhelming predominance of zerovalent iron has been synthesized. The nanocomposite has a core–shell–matrix structure in which Fe0 nanoparticles with an average size of 50 nm are located in the pyrocarbon matrix and coated with a ferrite shell preventing their aggregation and oxidation. The composite is distinguished for its high thermal stability, magnetic properties 59 G cm3/g, and electrical conductivity as high as that of graphite.
A new acrylic monomer derived from perfluoro-2-trichloromethylisopropanol was synthesized. Poly(perfluoro-2-trichloromethylisopropyl acrylate) was prepared by radical bulk polymerization, and its physicochemical properties were studied. It was found that the prepared polyacrylate can be used to manufacture optical waveguides.
Радикальной полимеризацией 1-трифторметил-1-ферроценил-2,2,2-трифторэтилметакрилата и его сополимеризацией с метилметакрилатом в органических растворителях и сверхкритическом диоксиде углерода синтезированы карбоцепные ферроценфторсодержащие (со)полимеры. Изучены их строение, растворимость, молекулярно-массовые и термические характеристики. Установлено, что введение 15 мол. % ферроценфторсодержащего мономера в цепь полиметилметакрилата приводит к повышению его термической и термоокислительной устойчивости.
Carbon-chain ferrocene-fluoro-containing (co)polymers are synthesized by the free-radical polymerization of 1-trifluoromethyl-1-ferrocenyl-2,2,2-trifluoroethyl methacrylate and its copolymerization with methyl methacrylate in organic solvents and supercritical carbon dioxide. The structures, solubilities, molecular masses, and thermal characteristics of these (co)polymers are studied. It is found that the introduction of 1–5 mol % of the ferrocene-fluoro-containing monomer in the chain of poly(methyl methacrylate) improves its thermal resistance and thermo-oxidative stability.
A number of new ionic vinyl monomers composed of 1-vinylimidazolium cation with diethoxy- and dihydroxyphosphoryl groups and various anions—Br−, (CN)2N−, and (CF3SO2)2N−—are synthesized. The free-radical polymerization of the monomers in solutions of molecular and ionic solvents yields new polymer analogs of ionic liquids, and their molecular-mass characteristics, solubility, heat resistance, thermal stability, and electrical conductivity are estimated. It is shown that the incorporation of bulky phosphorylalkyl side substituents into the vinylimidazolium polycation causes a decrease in the glass-transition temperature and an increase in the ionic conductivity of polymer salts. The highest ionic conductivity (2.6 × 10−5 S/cm at 25°C) is exhibited by the polymer with the (CN)2N− anion.
High-molecular-mass polymers ( M w up to 2.2 × 10 6 ) have been synthesized by the free-radical polymerization of 5-vinyl-and 2-methyl-5-vinyltetrazoles in ionic liquids with 1,3-dialkylimidazolium and tetraalkylphosphonium cations. Effects of the structure of monomers, the nature of ionic solvents, and the conditions of polymerization on the yield and molecular mass of poly( C -vinyltetrazoles) are studied. The structure and thermal characteristics of the polymers are examined. It has been shown that the incorporation of the methyl substituent at the second position of the 5-vinyltetrazoel heterocycle in ionic media gives rise to higher molecular mass polymers and improves their solubility.
Four vinyl monomers containing a covalently bonded cation ethylimidazolium and various anions—Br − , (CF 3 SO 2 ) 2 N − , (CN) 2 N − , and CF 3 SO 3 − —have been synthesized. High-molecular-mass polymers ( M w up to 1.84 × 10 6 ) having the structure of ionic liquids have been prepared via the free-radical polymerization of 1-vinyl-3-ethylimidazolium in bulk and molecular and ionic solvents. The thermal stability and heat resistance of the resulting polymer salts have been estimated. It has been demonstrated that the thermal characteristics of these salts significantly depend on the nature of anions. The glass-transition temperatures of the polymers range from 19 to 235°C. The ionic conductivity of the polymer salts and their compositions with individual ionic liquids has been studied in the frequency range 50–10 6 Hz. The highest conductivity (1.5 × 10 −5 S/cm) is exhibited by the polymer containing the (CN) 2 N − anion.
The free-radical polymerization of acrylonitrile and its copolymerization with methyl methacrylate in ionic liquids based on 1,3-dialkyl-substituted imidazole were studied. It was shown that, in contrast to the case of common molecular solvents, the polymerization and copolymerization in liquid organic salts give high-molecular-mass polyacrylonitrile and copolymers with high yields, with the former polymer showing a higher onset temperature of degradation.
The free-radical polymerization of methyl methacrylate in ionic liquids based on 1,3-dialkyl-substituted imidazole was studied. In contrast to the case of common solvents, the polymerization in liquid organic salts was shown to afford high-molecular-mass poly(methyl methacrylate) with a high yield.
An efficient method for methyl methacrylate radical polymerization by tri-n-propyl-, triisopropyl-, and triisobutylborane ammonia complexes, including the addition of a boron-containing initiating agent into the monomer in air, was developed. An advantage of this method is that the reaction occurs at room temperature, requires no peroxide components, and leads to polymers with enhanced thermal stability.
A method has been developed for the synthesis of polymeric phosphinocarborane complexes of rhodium(I), based on copolymerization of methyl methacrylate with salts of 1-isopropenyl(3)-1,2-dicarbaundecaborate and subsequent interaction of the resulting polymeric matrix with tris(triphenylphosphine)rhodium chloride.