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13C-NMR study of ethylene/1-hexene and ethylene/1-octene copolymers obtained using homogeneous catalysts

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Summary

This study employed the 13C-NMR spectroscopy to investigate the influence of the increase of the comonomer concentration on the microstruture of ethylene/1-hexene and ethylene/1-octene copolymers obtained by the use of MeSiCp2ZrCl2, Cp2ZrCl2, Et[Ind]2ZrCl2 and [Ind]2ZrCl2 catalysts. For both comonomers butyl or hexyl branches were isolated between ethylene blocks. As the α-olefin concentration in the copolymer increased, butyl or hexyl branches became closer, some of them, separated by only one or two ethylene units. Incorporation of α-olefin in the copolymer was higher for the bridged catalysts, MeSiCp2ZrCl2, and Et[Ind]2ZrCl2 than for the unbridged ones. The α-olefin size did not seem to effect its reactivity towards ethylene.

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Authors and Affiliations

  1. Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Goncalves 9500, 91501-970, Porto Alegre, Brazil

    Griselda B. Galland & Raquel S. Mauler

  2. PETROBRÁS/CENPES/DIQUIM, Radial 2, Quadra 7, Cidade Universitária, Ilha do Fundão, 21910-240, Rio de Janeiro, Brazil

    Sônia C. de Menezes

  3. Departmento de Ingeniería Química, Fac. Ciencias Físicas y Matemáticas, Universidad de Chile, Casilla, 2777, Santiago, Chile

    Raul Quijada

Authors
  1. Griselda B. Galland
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  2. Raquel S. Mauler
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  3. Sônia C. de Menezes
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  4. Raul Quijada
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Galland, G.B., Mauler, R.S., de Menezes, S.C. et al. 13C-NMR study of ethylene/1-hexene and ethylene/1-octene copolymers obtained using homogeneous catalysts. Polymer Bulletin 34, 599–604 (1995). https://doi.org/10.1007/BF00423357

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  • DOI: https://doi.org/10.1007/BF00423357

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