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Effect of alkylaluminum structure on Ziegler-Natta catalyst systems based on neodymium for producing high-cis polybutadiene

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Summary

In this work, a laboratory scale process for producing polybutadiene with high content of cis-1,4 repeating units was studied. A Ziegler-Natta catalyst system constituted of neodymium versatate (catalyst), an alkylaluminum compound (alkylating agent and cocatalyst) and tert-butyl chloride (chlorinating agent) was used. The solvent employed was a mixture of hexane and cyclohexane (80/20 v/v). The objective of this work was to evaluate the effect of alkylaluminum structure and the influence of Al/Nd (5 to 15) molar ratio of long chain alkylaluminium compound (tri(n-hexyl)aluminum) on catalyst activity and polybutadiene characteristics. The alkylaluminum compounds employed in this study were tri(i-butyl)aluminum, tri(n-hexyl)aluminum, tri(n-octyl)aluminum and di(i-butyl)aluminum hydride. The polybutadienes molar masses obtained were strongly influenced by the alkylaluminum structure. Polymers with the highest molar masses were obtained when tri(i-butyl)aluminum, tri(n-hexyl)aluminum and tri(n-octyl)aluminum were employed. However, polymers with the highest contents of cis-1,4 units and the lowest molar masses were produced when di(i-butyl)aluminum hydride was employed.

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Authors and Affiliations

  1. Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, P.O. Box 68525, 21945-970, Rio de Janeiro, RJ, Brasil

    Tereza C. J. Rocha, Fernanda M. B. Coutinho & Bluma G. Soares

  2. Departamento de Processos Químicos, IQ/UERJ, Rua São Francisco Xavier, 524, Pavilhão Haroldo Lisboa da Cunha, 4° andar, sala 424A, 20550-900, Rio de Janeiro, RJ, Brasil

    Fernanda M. B. Coutinho

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  1. Tereza C. J. Rocha
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  2. Fernanda M. B. Coutinho
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  3. Bluma G. Soares
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Rocha, T., Coutinho, F. & Soares, B. Effect of alkylaluminum structure on Ziegler-Natta catalyst systems based on neodymium for producing high-cis polybutadiene. Polym. Bull. 62, 1–10 (2009). https://doi.org/10.1007/s00289-008-1006-7

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  • DOI: https://doi.org/10.1007/s00289-008-1006-7

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