Abstracts

№4, 2018

On Effect of Different Oil Content on Properties of High-Molecular Neodymium cis-1,4-Polybutadiene

Fazilova D.R. (Ph.D. [Chem.], Chief of Lab), Gimaldinov D.R. ([Eng.-Techn.]), Borisenko V.N. (Chief of Lab), Tyutyugina D.V. ([Eng.-Techn.])

The influence of MES oil (trade mark Norman-132) and TDAE oil (trade mark Norman-346) in different content on rubber compounds and vulcanizates based on high-molecular cis-1,4-polybutadiene Nd-BR/CKDN (SKDN) were studied. The results were compared with properties of import oil-extended analogous grade (IA). The microstructure of rubber samples under study were defined by Perkin Elmer IR- spectrometer Spectrum 100 with FTIR device being applied. Rubber compounds were prepared in two phases: the first one in rubber mixer RheoMix 3000 OS (Haake Thermo Scientific), the second one – by curing group injection at laboratory mills Sm 350 150/150 (Polymermash). Viscosity and Mooney stress relief were defined by Mooney viscometer MV 2000, rheometric properties were defined by device MDR 2000 (Alpha Technologies). Dynamic properties were also measured: tgδ at 60 ° С and Payne effect were defined by device RPA 2000 (Alpha Technologies), rebound resilience – by Shob pendulum. It is shown that properties of SKDN with oil MES and TDAE are similar to each other and to IA. However, SKDN with TDAE dominates SKDN with MES in terms of nominal strength at break and elongation of vulcanizates. SKDN containing both oils up to 20 wt.% insignificantly dominates IA in terms of dynamic properties, however it goes after IA in terms of strength at break. It may be led by different molecular weight characteristics of rubbers.

Key words: cis-1,4-polybutadiene, IR- spectroscopy, processing oils, MES, TDAE, viscosity, rheometric properties, mechanical properties, Payne effect, tgδ, rebound resilience, resistance rolling

Study of Hydro-Sorption, Deformation and Strength Properties of TPV for Sealing Systems

Galikhanov M.F. (Prof., D. Sc. [Techn.]), Akhmedzyanova D.M. (Postgrad. Stud.)

Hydro-sorption TPV for the manufacture of gaskets for sealing systems has been proposed. This TPV is the blend of ethylene-vinyl acetate copolymer 11306-075 (EVAC), BNR (BNKS-28AMN) and water-soluble polymer sodium carboxymethyl cellulose «Polycell» KMC- 9B (Na-CMC). Components were mixed on laboratory mills in two stages: at the first stage BNR with the vulcanizing system and carbon black were mixed with Na-CMC at 50 °C, at the second stage this composition was mixed with the EVAC at 140 °C. Elastomer phase TPV was vulcanized at temperature 170°C. Hydro-sorption, deformation and strength properties of the TPV were studied under conditions of limited and unlimited water access. Swelling in water of ~ 67 % for composition consisting of 25 % EVAC, 22,5 % vulcanized BNR, and 52,5 % Na-CMC was shown. As a result of optimization of techniques of TPV preparation (mixing sequence of the components of the composition) deformation and strength characteristics of TPV increased on ~30 % and true strength 5,34 MPa and elongation at break 57 % were achieved. For the supposed field of application of developed hydro-sorption materials (sealing and sealing gasket) this level of strength properties is quite sufficient, because there are no strong tensile, compressive or shear loads in the course of their use.

Key words: TPV, hydro-sorption material, swelling, ethylene-vinyl acetate copolymer, BNR, sodium carboxymethyl cellulose, mechanical properties, sealing gaskets

The Use of DSC for Evaluation of the Protective Properties of Antioxidants in SBS

Korchagina I.P. (Sen. Res.), Nafikova N.G. (Sen. Res.), Strukova I.Yu. (Chief of Lab.), Suloeva Т.R. (Head of Method.-Analyt. Dep.)

The possibility of evaluating of resistance to oxidative destruction of styrene-butadiene thermoelastoplasts (SBS) stabilized by antioxidants (AО) is shown. The evaluation procedure is developed; it is based on determination of oxidation induction temperature (OIT) by DSC. Procedure of preparation of the samples for tests includes milling on the rolls within 1 minute (roll temperature (100±5) °С, roll opening 0,9 mm) with further molding (mold temperature (105±5) ºС, pressure 107 Pa). This provides high homogeneity of the samples in form of planes with parallel surfaces, and uniform thickness ((550±100) μm). Optimal mode for determining OIT: open cup with the sample, thermostatic control at 30 ºС within 5 minutes in a nitrogen atmosphere, air-blast heating from 30 to 250 ºС, heating rate 5 ºС/min. Maximal temperature is taken to preserve thermal stability, minimum – identity of initial state of samples, heating rate corresponds to oxidation reaction rate. Efficiency of 3 AО is evaluated. The sufficient growth of OIT of SBS with AО is found. The sample of most efficient AО is of higher OIT.

Keywords: DSC, oxidation induction temperature, SBS, antioxidants

Nano-and Microcomposites Based on Block Copolymer of Ethylene and Okten

Dolinskaya R.M. (Assist. Prof., Ph.D. [Chem.]), Prokopchuk N.R. (Corresponding Member of NASB, Prof., D. Sc. [Chem.]), Rusetskiy V.V. (Ph.D. [Techn.], First Deputy General Director, Techn. Director)

The effect of the nature and content of nanomodifiers (NM) and dispersed fillers (micromodifiers (MM)), on the rheological and mechanical properties of compositions based on a polyolefin thermoplastic elastomer –random copolymer of ethylene and okten of 35% of elastic blocks (EO TEP) is studied. As NM carbon black P 234 (CB) and silica БС-100 (S) were in use, as MM were in use talc TRPN (T) and graphite GE-1 (G). The incase of tensile strength and tear resistance of microcomposites at content of MM 5 phr and decrease at 10 phr is shown. Tensile strength of nanocomposites increase at content of NM at 1 phr and higher up to 10 phr because of increase of intermolecular interaction and density of modified EO TEP. The microparticles of T and especially G, acting as a structural plasticizers, increases the relaxation of internal stresses under dynamic loads, slow down the formation and growth of microcracks, increase the number of cycles before failure of modified EO TEP.

Key words: block copolymers, nano-modifiers, disperse fillers, rheological properties, mechanical properties

Silanization of Tread Rubber Compound of Car Tires. Part 3. Influence of Silanization on the Processing and Vulcanizing Properties of Rubber Compound

Dorozhkin V.P. (Prof, D.Sc. [Chem]), Salaev M.V. (Postgrad. Stud.), Mokhnatkin A.M. (Ph.D [Techn.], Head of Dep.), Mokhnatkina E.G. (Ph.D [Techn.], Assist. Prof.), Makhotin A.A. (Director), Prinada A.L. (Director)

The effect of silanization conditions of tread rubber compound on its processing and vulcanizing properties has been studied. It was found that the plasticity increases with increase of the dosage of silanizing agent TESPT, and green strength decreases. Elastic shrinkage of the mixture changes little with temperature, time of silanization and TESPT content. The best complex of processing properties of rubber compounds is achieved or at low temperature and high silanization time, or at high temperature and small time. Reduction in the TESPT content to 4 phr and the use of moderate silanization temperature (130ºC÷140ºС) and short time (100 sec) resulted in the good scorching resistance of rubber compounds. Degree of vulcanization depends only on the TESPT content and is maximal at 8 phr. The rate of vulcanization in the main period is also mainly depends on the TESPT content and is maximal at its maximal content of 16 phr and at low temperature and time of silanization.

Key words: silanization, tread rubber compound, processing and vulcanizing properties

Silanization of Tread Rubber Compound of Car Tires. Part 4. Influence of Silanization on Mechanical Properties of Tread Rubber

Dorozhkin V.P. (Prof., D.Sc. [Chem.]), Salaev M.V. (Postgrad. Stud.), Mokhnatkin A.M. (Ph.D. [Techn.], Head of Dep.), Mokhnatkina E.G. (Ph.D. [Techn.], Assist. Prof.), Makhotin A.A. (Director), Prinada A.L. (Director)

Influence of the silanization of tread rubber compounds on the mechanical properties of tread rubber of car tires has been studied.. It was found that stress at 100 % elongation f100, tensile strength fр, elongational at break εр and tear resistance fz depend mainly on the content of silanizing agent TESPT, temperature and time of silanization were of minor impotance. f100 and fр increase with increase of the TESPT content, and fz и εр are reduced. The best complex of the mechanical properties is realized at the minimum temperature (115 ºC), time of the silanization (35 s), and TESPT content (4,0 phr). To improve the elastic and strength properties of serial tread rubber is necessary to lower the temperature, the silanization time and TESPT content at the first stage of rubber mixing.

Key words: silanization, tread rubber, mechanical properties, tire tread

The Application of Pearson Distribution Family to the Problem of Evaluation of Physical and Mechanical Properties of Polymers

Khvostov A.A. (Prof., D. Sc. [Techn.]), Tikhomirov S.G. (Prof., D. Sc. [Techn.]), Bityukov V.K. (Prof., D. Sc. [Techn.]), Karmanova O.V. (Prof., D. Sc. [Techn.], Chief of Chair), Khaustov I.A. (Assist. Prof., Ph. D. [Techn.], Chief of Chair), Popov A.P. (Assistant)

The results of universal Pearson distributions application to the approximation of polymer multimodal distributions properties on the example of mechanical loss angle tangent tgδ are presented. The basis of the calculated dependencies is the solutions of Pearson differential equations. The frequency and temperature distributions of tgδ are described by these solutions, and the form of distribution is evaluated with the use of chosen moments of experimental relaxation spectra and tgδ. Mathematical model and algorithm of data processing for building the approximating dependence of tgδ were developed. Experimental data of polyamide 6.12 of 19 % crystallinity obtained under 1 Hz were in use as an example. It is shown that the structure of obtained model is simple enough and used the statistical moments of every mode of distribution. Model adequately describes the experimental data and allows quickly assess the character of temperature or relaxation transitions and thereby to improve the quality control of polymers, including elastomers.

Key words: universial Pearson distribution, approximation, simulation, tgδ, elastomers

Simulation of Kinetics of Thermomechanical Destruction of Amorphous Rubbers

Tikhomirov S.G. (Prof., D. Sc. [Techn.]), Karmanova O.V. (Prof., D. Sc. [Techn.], Chief of Chair), Khaustov I.A. (Assist. Prof., Ph. D. [Techn.], Chief of Chair), Khvostov A.A. (Prof., D. Sc. [Techn.]), Popov A.P. (Assistant), Skachkov A.M. (Postgrad. Stud.)

The influence of thermomechanical processing on the Mooney viscosity changes is studied by example of amorphous SBR (SKS-30 ARK). The mathematical description of the change of moments of MMR in the process of thermomechanical destruction (TMD) at processing is presented. The assumption about the equal probability of destruction act in arbitrary place of polymer chain is maid. A mathematical model of the Mooney viscosity changes in TMD process has been developed. Based on this model the prediction of the behavior of rubbers in the course of their processing is possible. Constants of destruction rate are identified with the use of experimental data on TMD kinetics at temperatures 100, 110, and 120 ºС. It is found, that the kinetics of degradation process can be approximated by an exponential law of viscosity change over time at the constant temperature and shear rate.

Key words: rubber, processing, degradation, kinetics, mathematical model

Development of Composition of Roll Elastomer Coating of Asphalt Automotive Roads with the Use of Numerical Experiment

Lyubimova N.Yu. (Senior Lecturer), Ermilov A.S. (Prof., D. Sc. [Techn.], Nurullaev E. (Ph.D. [Phys.-Mat.], Assist. Prof.)

The composition of the elastomeric rolled composite material (RCM) based on high-molecular rubber, copolymer of divinyl and isoprene, SKID-L is developed. Plasticizer – dioctylsebacate, filler – silicone dioxide (river sand), vulcanizing agent – sulfur. Deformation and strength properties of RCM were defined by tensile tester RM-50 of a relative speed of stretching of 1.210-3 s-1. Its elongation at break increases from 25 to 35 %, and tensile strength from 0.5 to 2 MPa under decrease of temperature from 323 to 223K. The developed RCM is intended to protect a surface of asphalt motor roads. The analysis of service conditions and requirements to RCM properties is carried out. Mooney-Rivlin equation of coefficients C1 and C2 depended on the parameters of properties of RCM and its components and also on experimental conditions is presented. These data are provided. Results of an experimental stress-strain curves of RCM at a constant speed of stretching are compared with calculated ones, and their coincide is shown. Strength properties of RCM were compared with strength properties of the earlier developed composite based on blend of low-molecular rubbers SKD-KTR and PDI-3B. The modified failure envelops method was in use for comparison. The considerable advantages of new developed RCM are shown.

Key words: SKID-L, silicon dioxide (river sand), deformation and strength properties, rolled composite material, covering of asphalt motor roads, numerical experiment, Mooney-Rivlin equation, failure envelops

The News in the Field of Science, Technology and Production of Rubber and Rubber Materials and Goods 8th RUSSIAN RUBBER CONFERENCE Rubber’2018: Traditions and Innovations Part II

Reznichenko S.V. (D. Sc. [Techn.], Chief of Chair, Editor in Chief), Morozov Yu.L. (Prof., D. Sc. [Techn.], Deputy Editor, Consultant of Gen. Director), Potapov E.E. (Prof., D. Sc. [Chem.], Konikova T.B. ( Executive Director, Project Director–Executive Secretary), Yurchenko A.Yu. (Res.)

Part II of detail review of papers presented on 8th Conference «Rubber’2018: Traditions and Innovations» (Moscow, Expocenter,

25 – 26.04.18)

Key words: conference, round-table, posters, standards TK-160, rubbers of nontraditional sources, modification, synthesis, antiturbulent agents, initiators, oligomers, latexes, BNR, HBNR, SBR, polychloroprene, ethylene-propylene and fluorine containing rubbers, TEP, ecology, waste water, silica, shungit, micro sphere, oil- and low temperature resistance, heat shield, water- and other media swelling, electro physical properties, refractoriness, rubber/textile material

In the Regime of Expectation

Post-release on the Conference «Polyurethanes 2018»

Post-release on the 11th Conference «Polyurethanes» (2018) organized by INVENTRA (26.02.18, Moscow).

Key words: polyurethanes, synthesis, polyols, polyethers, polyeters, propylene oxide, foamed polyurethanes, isocyanates, building, auto- and furniture industry, refrigerators, heat-insulation, fire-safety, raw materials costs, import, importsubstitution