Abstracts

№3, 2009

The Advancement of Coagulation of Emulsion Styrene-Butadiene Rubber with the Use of Organic Coagulators – Odin A.P., Rachinskii A.V. (P. 2).

Comparison of salt-free coagulation processes of emulsion styrene-butadiene rubber of different organic coagulators is presented. Advances of water-soluble cation polyelectrolyte VPK-402 by Sterlitamak JSK «Kaustik».

Key words: salt-free coagulation, organic coagulators, emulsion styrene-butadiene rubber

Synthesis of trans-1,4-Copolymers of Butadiene and Isoprene on Titanium-Magnesium Catalysts – Smetannikov O.V., Mushina E.A., Chinova M.S., Gavrilenko I.F., Podolskii Yu.Ya., Bondarenko G.N., Shklyaruk B.F., Antipov E.M. (P. 5).

Copolymerization of butadiene and isoprene over titanium-magnesium catalysts leading to production random high-trans-copolymers has been investigated. The yields of copolymers are close to quantitative ones. Titanium-magnesium catalysts allow to produce crystalline and amorphous copolymers of butadiene and isoprene. The copolymerization constants have been determined.

Key words: copolymerization, trans-copolymers of butadiene and isoprene, titanium-magnesium catalysts, polymer yield.

Polymerization Kinetics and Molecular Properties of Neodymium-based Polybutadiene: Effect of Halogenated Agent Concentrtion – Akhmetov I.G., Kozlov V.G., Salakhov I.I., Sakhabutdinov A.G., D'yakonov G.S. (P. 7).

Polymerization kinetics of butadiene over catalytic system of neodymium versatate–diisobutyl aluminum hydride – hexachloro-p-xylene at different halogenated agent concentration was studied. The microstructure and the molecular properties of the produced rubber samples were studied by means of IR spectroscopy and GPC. The results confirm the previous assumption about the presence at last of two types of centers in the used catalytic system.

Key words: polymerization kinetics, butadiene, neodymium catalysts.

Production of Butyl Rubber in Suspension over Isoprene-Modified Aluminum Chloride – Markina E.A., Chelnokova S.Z., Sofronova O.V., Akhmed'yanova R.A., Ziyatdinov A.Sh., Shiyapov R.T., Sakhabutdinov A.G., Gil'mutdinov N.R., Gil'manov Kh.Kh. (P.10).

In order to decrease the initial polymerization rate of butyl rubber, the catalytic complex was modified with isoprene by addition of isoprene to the catalyst solution. The introduction of the optimal quantity of isoprene open the possibility to conduct the copolymerization process in more stable thermal conditions and at higher isobutylene concentrations. As a result the polymer yield is increased without the degradation of polymer properties.

Key words: polymerization, butyl rubber, catalytic complex, polymer yield.

Polymerization of Isoprene over Sodium-Magnesium-Based Catalytic System. Effect of Polymerization Conditions on Microstructure of 3,4-Polyisoprene – Tverdov A.I., Otvalko Zh.A., Mironyuk V.P., Kuz'min S.V. (P. 13).

New catalytic system based on organosodium- and organo-magnesium compounds has been developed. Ecological and economical advances of this system as well as possibility to product 3,4-polyisoprene of molecular weight from 20 000 to 250 000 and vinyl units (1,2 and 3,4) content from 48 to 90 % are shown.

Key words: polymerization, catalytic complex, 3,4-polyisoprene

The Effect of Macromolecular Structure of Polymers on Properties of Multicomponent Thermoplastic Elastomer Compositions – Novokshonov V.V., Glukhov V.V., Kropachev R.V., Musin I.N., Kimel'blat V.I. (P. 16).

Properties of TPR based on high pressure polyethylene (HPPE) and butadiene acrylonitrile rubber (BNR) with addition of ethylene-propylene rubber (EPDM) have been studied. Effect of molecular structure of components, especially EPDM and partial vulcanization, on swelling in particular, is shown.

Key words: TPR, BNR, EPDM, swelling.

Physical Modification of Diene Rubbers as a Method of Abrupt Improvement of Processing Properties of Rubber Compounds and Mechanical Properties of Vulcanized Rubbers. Part IV. Effect of Physical Modification of Isoprene Rubber SKI-3 on Its Molecular and Topological Characteristics – Dorozhkin V.P., Galimova E.M., Il'yasov R.S. (P. 20).

Effect of physical modification of isoprene rubber SKI-3 on its structure has been studied. Decrease of molecular weight and increase of branching of lower molecular weight is shown.

Key words: physical modification, isoprene rubber, molecular weight.

Production of Modifiers of RU-Type on the Base of New Nitrogen-Containing Heterocycles – Logvinova M.Ya., Shukkur A.Kh., Sakharova E.V., Potapov E.E. (P. 22).

New nitrogen-containing heterocycles have been synthesized, their properties studied, and molecular complexes of RU-type on their base were prepared. The possibility to use of these complexes as modifiers of compositions based on synthetic isoprene rubber SKI-3 is shown.

Key words: heterocycles, modifiers of RU-type, isoprene rubber SKI-3

Liquid Phase Filling of Styrene-Butadiene Rubbers of Solution Polymerization with the Use of Silica (“White Carbon”) – Rakhmatullin A.I., Eliseeva I.V., Kazakov Yu.M., Maschenko V.I., Gafarov A.M. (P. 24).

Method is developed for mixing of solution of styrene-butadiene rubbers with suspension of silica. After degasification these mixtures are in use for production of rubber compounds. Properties of compounds are comparable with that of carbon black filled ones.

Key words: styrene-butadiene rubber, silica, liquid phase filling.

New Processing Additives for Rubber Compounds Based on Butadiene Acrylonitrile Rubbers – Ushmarin N.F., Kol'tsov N.I. (P. 26).

New processing additives for rubber compounds based on butadiene acrylonitrile rubbers have been developed. Some surfactants and known substances are in use. Their application in rubber compounds results in improvement of processing properties.

Key words: processing additives, processing properties, surfactants

Study of Activity of Tetraalkoxysilanes on Interaction with Siloxanols – Boev V.V, Kopylov V.M., Kovyazin V.A., Sokol'skaya I.B., Astapov B.A. (P. 29).

Interaction of tetraalkoxysilanes of 2-aminoethoxy-, 2-methoxyethoxy- and 2-ethoxyethoxysubstituents at silicon atom with oligodimethylsiloxane-a,w-diols was studied. Possibility of the use of Si(OCH2CH2NH2)4 as crosslinking agent without catalyst was shown. Crosslinking with Si(OEt)n(OCH2CH2OMe)4-n and Si(OEt)n(OCH2CH2OEt)4-n is possible only in presence of catalytic amount amino- or tinorganic compounds.

Key words: liquid siloxanes, crosslinking.

Production of Softener of Rubber Compound by Pyrolysis of Tires – Minigaliev T.B., Dorozhkin V.P., Sukhova O.A., Il’yasov R.S., Mokhnatkina E.G. (P. 32).

Method of production of softener of rubber compound by pyrolysis of tires is proposed. Properties of tire rubbers with this softener are compared with that of processing oil PN-6 and possibilities of the substitution are shown.

Key words: pyrolysis of tires, processing oil, PN-6.

Prediction of Fatigue Life of Pnuematic Tires – Sokolov S.L., Nenakhov A.B. (P. 35).

Mathematical model for stress-strain state analysis in stress concentration zones of pneumatic tires based on finite element method is developed. Fatigue curves of rubber-cord samples for various types of stress-strain state for normal conditions and 80 °C are constructed. Stress-strain state calculations of belt edges zone 9,00R20 tire are carried out, the calculating endurance of this zone is defined.

Key words: tires, mathematical model, stress-strain state, finite element method, prediction of fatigue life

Training of Producers – Exporters to EU of Rubbers and Rubber Compounds and Articles, to Meet the Requirements of REACH Regulation – Soldatova N.V. (P. 39).

Review of Regulation EC No 1907/2006 concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) is presented. Special attention is given to explanation of Regulation’s requirements to chemicals in polymers and to manufacturers’ activity on registration of chemicals contained in their products exporting into EU.

Key words: REACH Regulation, requirements to chemicals in polymers