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Influence of indenyl ligand substitution pattern on metallocene-catalyzed ethene copolymerization with 1-octene

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1997

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Schneider, Martin Julius
Suhm, Jürgen
Mülhaupt, Rolf
Prosenc, Marc-Heinrich

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Macromolecules. 1997, 30(11), pp. 3164-3168. ISSN 0024-9297. eISSN 1520-5835. Available under: doi: 10.1021/ma961844z

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The influence of silylene-bridged bis(indenyl) ligand substitution, especially benzannelation and 2-methyl substitution, on methylaluminoxane-activated metallocene-catalyzed ethene/1-octene copolymerization in toluene at 40 °C was investigated. 2-Methyl substitution gave significantly higher molecular masses at the expense of catalyst activity, whereas benzannelation promoted 1-octene incorporation and randomness of the resulting poly(ethene-co-1-octene) copolymers. Force field calculations based on steric arguments were used to explain experimental copolymerization results. Activation energy differences between ethene and 1-octene insertion accounted for improved 1-octene incorporation in the case of benzannelated metallocenes. According to 13C-NMR microstructure analysis, copolymerization followed first-order Markov statistics.

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540 Chemie

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ISO 690SCHNEIDER, Martin Julius, Jürgen SUHM, Rolf MÜLHAUPT, Marc-Heinrich PROSENC, Hans-Herbert BRINTZINGER, 1997. Influence of indenyl ligand substitution pattern on metallocene-catalyzed ethene copolymerization with 1-octene. In: Macromolecules. 1997, 30(11), pp. 3164-3168. ISSN 0024-9297. eISSN 1520-5835. Available under: doi: 10.1021/ma961844z
BibTex
@article{Schneider1997Influ-23755,
  year={1997},
  doi={10.1021/ma961844z},
  title={Influence of indenyl ligand substitution pattern on metallocene-catalyzed ethene copolymerization with 1-octene},
  number={11},
  volume={30},
  issn={0024-9297},
  journal={Macromolecules},
  pages={3164--3168},
  author={Schneider, Martin Julius and Suhm, Jürgen and Mülhaupt, Rolf and Prosenc, Marc-Heinrich and Brintzinger, Hans-Herbert}
}
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