Lebedev Research Institute of Synthetic Rubber

Saint Petersburg, Russia

Lebedev Research Institute of Synthetic Rubber

Saint Petersburg, Russia
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Krutov S.M.,Saint Petersburg State University | Voznyakovskii A.P.,Lebedev Research Institute of Synthetic Rubber | Gribkov I.V.,GCE Group | Shugalei I.V.,Saint Petersburg State Polytechnic University
Russian Journal of General Chemistry | Year: 2014

The review considers problems related to processing of lignin-containing wastes. © 2014 Pleiades Publishing, Ltd.


Khoroshavina Yu.V.,Lebedev Research Institute of Synthetic Rubber | Nikolaev G.A.,Lebedev Research Institute of Synthetic Rubber
Russian Journal of General Chemistry | Year: 2013

Vinylation of silanes and disiloxanes has been studied. It has been shown that in the reactions of silanes with vinyl chloride and magnesium or sodium the sole product formed is tetravinylsilane. In the reactions of hexaethoxydisiloxane with vinyl chloride and magnesium, tetravinylsilane is the sole product formed. Hexavinyldisiloxane with yield up to 85% is formed in the reaction of hexaethoxydisiloxane with vinyl chloride and magnesium in the presence of copper(II) salts as alkylation catalyst. © 2013 Pleiades Publishing, Ltd.


Genkin A.N.,Lebedev Research Institute of Synthetic Rubber | Khoroshavina Yu.V.,Lebedev Research Institute of Synthetic Rubber | Nikolaev G.A.,Lebedev Research Institute of Synthetic Rubber | Voznyakovskii A.P.,Lebedev Research Institute of Synthetic Rubber
Polymer Science - Series A | Year: 2013

The effect of the 2′-(3-trifluoromethyl-2,2,3-trifluorocyclobutyl) ethyl radical in fluorosiloxane on the thermodynamics of dissolution of various low-molecular-mass compounds in this polymer is studied via inverse gas chromatography. The activity coefficients at infinite dilution, Ω 1 ∞, in the temperature range 20-100 C are determined for C6-C8 n-alkanes, cyclohexane, benzene, toluene, tetrachloromethane, trichloromethane, 2-butanone, and ethyl acetate. Flory-Huggins interaction parameters χ 12 ∞ are calculated. It is shown that hydrocarbons are poor solvents (Ω 1 ∞ > 6, χ 12 ∞ > 0.5) and that the studied fluorosiloxane is not inferior to commercial polymethyl(3,3,3-trifluoropropyl)siloxane with respect to stability in nonpolar liquid media in the range 20-70 C. Trichloromethane (above 50 C) and compounds containing a carbonyl group are found to be good solvents. The dispersion component of the solubility of the polymer, δ 2, is determined to be 14.0 (J/cm3)1/2 at 20 C and slightly lower, 13.5 (J/cm3)1/2, at 100 C. Possible causes of these low values of δ2 are discussed. © 2013 Pleiades Publishing, Ltd.


Rodin V.M.,Lebedev Research Institute of Synthetic Rubber | Lovchikov V.A.,Lebedev Research Institute of Synthetic Rubber
Polymer Science - Series B | Year: 2014

A model of the formation of sequences of stereochemical configurations in chain macromolecules that was proposed by Coleman and Fox is considered. Previously, it was thought that this model can not be represented by Markov statistics of any order. On the basis of an analysis of the model equations, it is shown that these sequences can be represented by Markov statistics and describe chain growth approximately with a precision similar to that of the classical second-order Markov model, widely used to describe stereosequences. © 2014, Pleiades Publishing, Ltd.


Kalinin A.V.,Lebedev Research Institute of Synthetic Rubber | Gavrilov A.S.,Lebedev Research Institute of Synthetic Rubber
Russian Journal of Applied Chemistry | Year: 2012

A polyether oligomer with terminal hydroxy groups was modifi ed in succession with 2, 4-toluene diisocyanate, allyl alcohol, and trimethoxysilane (hydrosilation). The modifi ed oligomer was vulcanized by the method used for vulcanization of organosilicon elastomers. The effect of additions of SF-2 fullerene-containing black on the mechanical properties of the vulcanizate was examined. © 2012 Pleiades Publishing, Ltd.


Rozentsvet V.A.,Russian Academy of Sciences | Kozlov V.G.,Russian Academy of Sciences | Korovina N.A.,Russian Academy of Sciences | Ivanova V.P.,Lebedev Research Institute of Synthetic Rubber | Kostjuk S.V.,Belarusian State University
Journal of Applied Polymer Science | Year: 2013

Technology of industrial production of liquid rubber under trademark "SKOP" is based on the cationic polymerization of 1,3-penadiene (piperylene) in the presence of TiCl4 or AlCl3-based catalytic systems. The disadvantage of these catalytic systems is the high probability of formation of branched and insoluble fractions due to the chain transfer to polymer. This deteriorates the useful qualities of SKOP. Here we propose the new initiating systems for the cationic polymerization of 1,3-pentadiene based on the homogeneous (dissolved in a minimal amount of diethyl ether) zinc halides (ZnCl2 and ZnBr2) as coinitiators and hydrochloric acid, tert-butyl chloride or trichloroacetic acid as initiators. These initiating systems allow to synthesize fully soluble low molecular weight (Mn = 1000-3000 g mol-1) poly(1,3-pentadiene)s with relatively narrow molecular weight distribution (Mw/Mn < 2.0), which do not contain any high molecular weight and insoluble fractions in the whole range of monomer conversion. The polymers synthesized in the presence of zinc halides possess the same microstructure that those prepared with TiCl4 as coinitiator. © 2012 Wiley Periodicals, Inc.


Rozentsvet V.A.,Russian Academy of Sciences | Korovina N.A.,Russian Academy of Sciences | Ivanova V.P.,Lebedev Research Institute of Synthetic Rubber | Kuznetsova M.G.,RAS Institute of Chemistry | Kostjuk S.V.,Belarusian State University
Journal of Polymer Science, Part A: Polymer Chemistry | Year: 2013

The microstructure of poly(1,3-pentadiene) synthesized by cationic polymerization of 1,3-pentadiene with tBuCl/TiCl4 initiating system is analyzed using one-dimensional- and two-dimensional-NMR spectroscopy. It is shown that unsaturated part of chain contains only homo and mixed dyads with trans-1,4-, trans-1,2-, and cis-1,2-structures with regular and inverse (head-to-head or tail-to-tail) enchainment, whereas cis-1,4- and 3,4-units are totally absent. The new quantitative method for the calculation of content of different structural units in poly(1,3-pentadiene)s based on the comparison of methyl region of 13C NMR spectra of original and hydrogenated polymer is proposed. The signals of tert-butyl head and chloromethyl end groups are identified in a structure of poly(1,3-pentadiene) chain and the new approaches for the quantitative calculation of number-average functionality at the α- and ω-end are proposed. © 2013 Wiley Periodicals, Inc.


Voznyakovskii A.P.,Lebedev Research Institute of Synthetic Rubber | Ginzburg B.M.,Russian Academy of Sciences | Rashidov D.,Tajik National University | Tochil'Nikov D.G.,Russian Academy of Sciences | Tuichiev Sh.,Tajik National University
Polymer Science - Series A | Year: 2010

The effect of modifying additives based on detonation nanodiamonds on the tribological characteristics of polyurethane rubber is studied. Introduction of modifying additives based on detonation nanodiamonds (0.5 wt %) leads to a marked improvement in the antifriction and wear-resistance characteristics under conditions of boundary sliding friction for steel and for lubrication with water. The attained tribological characteristics (total energy loss for friction, weight loss of polymer during tribological contact, maximum admissible working pressure) are well (∼300%) above the corresponding characteristics of foreign analogs. Changes in the tribological characteristics of the formed nanocomposite material are observed, but the elastic and strength characteristics remain unchanged. © 2010 Pleiades Publishing, Ltd.


Frantsuzova Y.V.,Lebedev Research Institute of Synthetic Rubber | Khoroshavina Y.V.,Lebedev Research Institute of Synthetic Rubber | Nikolaev G.A.,Lebedev Research Institute of Synthetic Rubber
Russian Journal of General Chemistry | Year: 2014

Influence of various Pt-containing catalytic systems and additives to them on regioselectivity of styrene hydrosilylation by methyldichlorosilane was studied. The regiospesific approach to methyl(2-phenylethyl)dichlorosilane in the presence of tetrakis(triphenylphosphine)platinum Pt(0) is developed. © 2014 Pleiades Publishing, Ltd.


Lebedev N.V.,Lebedev Research Institute of Synthetic Rubber | Zhuravlev M.V.,Lebedev Research Institute of Synthetic Rubber | Lovchikov V.A.,Lebedev Research Institute of Synthetic Rubber | Berenblit V.V.,Lebedev Research Institute of Synthetic Rubber
Polymer Science - Series B | Year: 2012

The use of the deterministic model of chain growth for the copolymerization of vinylidene fluoride and hexafluoropropene instead of the classical Markov model makes it possible to correctly relate the data of the 19F NMR spectra of copolymers with different compositions to the mechanism of formation of macromolecules. The possible mechanism of copolymerization in the proposed model description involves the coordination of the radical center of the growing chain on the double bond of a monomer with subsequent incorporation of the monomer unit into the polymer chain. Although the proposed model disregards the orientation of monomer units along the chain, it properly describes the experimental data and provides an idea of the alternation of units in the copolymer at different copolymer compositions. © Pleiades Publishing, Ltd., 2012.

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