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Characteristics of Stereoregular cis-1,4-Polyisoprene Obtained under the Conditions of a Large-Tonnage Production Process on Titanium and Lanthanide Catalysts Modified in Turbulent Flows

  • Macromolecular Compounds and Polymeric Materials
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Abstract

cis-1,4-Polyisoprene was prepared under conditions of the industrial production process using small high-performance diffuser–confuser tubular turbulent apparatuses in the stage of formation of titanium, neodymium, and gadolinium Ziegler–Natta catalysts, and characteristics of the synthesized rubber were determined. The catalytic systems can be ranked in the following order with respect to the content of cis-1,4-units in the synthesized polyisoprene: titanium (96.3%)–neodymium (97.5%)–gadolinium (99%); the polyisoprene obtained on lanthanide catalysts contains no trans-1,4-units. The mean molecular masses of polyisoprene increase in the same order, whereas the polydispersity coefficient varies insignificantly. Natural rubber compared to synthetic analogs contains virtually no thermally stable compounds, is characterized by higher surface microhardness, and contains about 1% volatiles.

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ACKNOWLEDGMENTS

The study was performed within the framework of the government assignment of the Ministry of Science and Higher Education of the Russian Federation (project no. FZWU-2020-0027).

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Authors and Affiliations

  1. OAO Sintez-Kauchuk, Sterlitamak, 453110, Bashkortostan, Russia

    I. Sh. Nasyrov & D. A. Zhavoronkov

  2. OOO TAU NefteKhim, Sterlitamak, 453110, Bashkortostan, Russia

    O. K. Shurupov

  3. Ufa Institute of Chemistry, Ufa Federal Research Center, Russian Academy of Sciences, Ufa, 450076, Bashkortostan, Russia

    E. M. Zakharova

  4. Nizhnekamsk Institute of Chemical Technology, Branch of Kazan National Research University of Technology, Nizhnekamsk, 423578, Tatarstan, Russia

    V. A. Vasil’ev

  5. Bashkir State University, Ufa, 450076, Bashkortostan, Russia

    E. M. Zakharova & V. P. Zakharov

Authors
  1. I. Sh. Nasyrov
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  2. D. A. Zhavoronkov
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  3. O. K. Shurupov
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  4. E. M. Zakharova
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  5. V. A. Vasil’ev
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  6. V. P. Zakharov
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Contributions

I.Sh. Nasyrov, D.A. Zhavoronkov, and O.K. Shurupov participated in formulation of the concept, collection and analysis of the experimental data, writing of the text, and adoption of the final version of the paper (sections describing the isoprene polymerization under the conditions of the industrial production process); V.A. Vasil’ev participated in comparative analysis of the molecular characteristics of synthetic polyisoprene obtained on various catalytic systems and of natural rubber, collected the published data, and formulated the main conclusions of the study; E.M. Zakharova and V.P. Zakharov performed the thermal analysis, analysis by gel permeation chromatography, and microhardness measurements, summarized the results obtained, and participated in formulation of conclusions of the study.

Corresponding author

Correspondence to V. P. Zakharov.

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The authors declare that they have no conflict of interest.

Additional information

Translated from Zhurnal Prikladnoi Khimii, No. 6, pp. 728–735, January, 2021 https://doi.org/10.31857/S0044461821060074

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Nasyrov, I.S., Zhavoronkov, D.A., Shurupov, O.K. et al. Characteristics of Stereoregular cis-1,4-Polyisoprene Obtained under the Conditions of a Large-Tonnage Production Process on Titanium and Lanthanide Catalysts Modified in Turbulent Flows. Russ J Appl Chem 94, 741–747 (2021). https://doi.org/10.1134/S1070427221060070

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  • DOI: https://doi.org/10.1134/S1070427221060070

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