@article{Jungling1995dorma-24062,
  year={1995},
  doi={10.1002/masy.19950970121},
  title={The role of dormant sites in propene polymerization using methylalumoxane activated metallocene catalysts},
  number={1},
  volume={97},
  issn={1022-1360},
  journal={Macromolecular Symposia},
  pages={205--216},
  author={Jüngling, Stephan and Mülhaupt, Rolf and Stehling, Udo and Brintzinger, Hans-Herbert and Fischer, David and Langhauser, Franz}
}

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    <dc:creator>Stehling, Udo</dc:creator>
    <dc:contributor>Fischer, David</dc:contributor>
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    <dc:creator>Brintzinger, Hans-Herbert</dc:creator>
    <dc:creator>Fischer, David</dc:creator>
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    <dc:contributor>Jüngling, Stephan</dc:contributor>
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    <dc:contributor>Langhauser, Franz</dc:contributor>
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    <dcterms:title>The role of dormant sites in propene polymerization using methylalumoxane activated metallocene catalysts</dcterms:title>
    <dc:contributor>Stehling, Udo</dc:contributor>
    <dc:contributor>Brintzinger, Hans-Herbert</dc:contributor>
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    <dcterms:abstract xml:lang="eng">Propene polymerization of methylalumoxane (MAO) activated rac-Me&lt;sub&gt;2&lt;/sub&gt;Si(Benz[e]Indenyl)&lt;sub&gt;2&lt;/sub&gt;ZrCl&lt;sub&gt;2&lt;/sub&gt; (BI) and rac-Me&lt;sub&gt;2&lt;/sub&gt;Si(2-Me-Benz[e]Indenyl)&lt;sub&gt;2&lt;/sub&gt;ZrCl&lt;sub&gt;2&lt;/sub&gt; (MBI) was studied to investigate the influence of the ligand substitution pattern and the role of dormant sites. Poly(propene) end group composition as well as regio- and stereoirregularities were examined by means of &lt;sup&gt;1&lt;/sup&gt;H- and &lt;sup&gt;13&lt;/sup&gt;C-NMR spectroscopy. Dormant sites, resulting from 2, 1-propene insertion, were reactivated either by β-hydrogen transfer to propene, yielding 2-butenyl end groups, or by 1, 2-insertion of propene, yielding regioirregularities. Propene polymerization in the presence of hydrogen gave n-butyl end groups and less regioirregularities as expected for hydrogenolysis of such dormant sites. Methyl substitution in 2-position of the benz[e]indenyl ligand suppressed β-hydrogen transfer to propene, and increased molecular weight with increasing propene concentration. Also, activation energy increased from 30 kJ/mol (BI/MAO) to 59 kJ/mol (MBI/MAO). For both catalysts activity depended on propene concentration. The order of reaction relative to propene was 1.7.</dcterms:abstract>
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