The role of dormant sites in propene polymerization using methylalumoxane activated metallocene catalysts

Lade...
Vorschaubild
Dateien
Juengling_240629.pdf
Juengling_240629.pdfGröße: 3.74 MBDownloads: 821
Datum
1995
Autor:innen
Jüngling, Stephan
Mülhaupt, Rolf
Stehling, Udo
Fischer, David
Langhauser, Franz
Herausgeber:innen
Kontakt
ISSN der Zeitschrift
Electronic ISSN
ISBN
Bibliografische Daten
Verlag
Schriftenreihe
Auflagebezeichnung
ArXiv-ID
Internationale Patentnummer
Angaben zur Forschungsförderung
Projekt
Open Access-Veröffentlichung
Open Access Green
Sammlungen
Core Facility der Universität Konstanz
Gesperrt bis
Titel in einer weiteren Sprache
Forschungsvorhaben
Organisationseinheiten
Zeitschriftenheft
Publikationstyp
Zeitschriftenartikel
Publikationsstatus
Published
Erschienen in
Zusammenfassung

Propene polymerization of methylalumoxane (MAO) activated rac-Me2Si(Benz[e]Indenyl)2ZrCl2 (BI) and rac-Me2Si(2-Me-Benz[e]Indenyl)2ZrCl2 (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 1H- and 13C-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.

Zusammenfassung in einer weiteren Sprache
Fachgebiet (DDC)
540 Chemie
Schlagwörter
Konferenz
Rezension
undefined / . - undefined, undefined
Zitieren
ISO 690JÜNGLING, Stephan, Rolf MÜLHAUPT, Udo STEHLING, Hans-Herbert BRINTZINGER, David FISCHER, Franz LANGHAUSER, 1995. The role of dormant sites in propene polymerization using methylalumoxane activated metallocene catalysts. In: Macromolecular Symposia. 1995, 97(1), pp. 205-216. ISSN 1022-1360. eISSN 1521-3900. Available under: doi: 10.1002/masy.19950970121
BibTex
@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}
}
RDF
<rdf:RDF
    xmlns:dcterms="http://purl.org/dc/terms/"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:bibo="http://purl.org/ontology/bibo/"
    xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#"
    xmlns:foaf="http://xmlns.com/foaf/0.1/"
    xmlns:void="http://rdfs.org/ns/void#"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > 
  <rdf:Description rdf:about="https://kops.uni-konstanz.de/server/rdf/resource/123456789/24062">
    <dc:creator>Stehling, Udo</dc:creator>
    <dc:contributor>Fischer, David</dc:contributor>
    <dcterms:rights rdf:resource="https://rightsstatements.org/page/InC/1.0/"/>
    <dcterms:issued>1995</dcterms:issued>
    <dcterms:bibliographicCitation>Macromolecular Symposia ; 97 (1995), 1. - S. 205-216</dcterms:bibliographicCitation>
    <dc:creator>Brintzinger, Hans-Herbert</dc:creator>
    <dc:creator>Fischer, David</dc:creator>
    <dc:creator>Langhauser, Franz</dc:creator>
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2013-07-29T07:34:18Z</dcterms:available>
    <dc:contributor>Jüngling, Stephan</dc:contributor>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/29"/>
    <dc:creator>Jüngling, Stephan</dc:creator>
    <dc:creator>Mülhaupt, Rolf</dc:creator>
    <dc:rights>terms-of-use</dc:rights>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dc:contributor>Langhauser, Franz</dc:contributor>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/29"/>
    <dc:language>eng</dc:language>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2013-07-29T07:34:18Z</dc:date>
    <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/24062"/>
    <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>
    <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/24062/1/Juengling_240629.pdf"/>
    <dc:contributor>Mülhaupt, Rolf</dc:contributor>
    <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/24062/1/Juengling_240629.pdf"/>
    <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>
  </rdf:Description>
</rdf:RDF>
Interner Vermerk
xmlui.Submission.submit.DescribeStep.inputForms.label.kops_note_fromSubmitter
Kontakt
URL der Originalveröffentl.
Prüfdatum der URL
Prüfungsdatum der Dissertation
Finanzierungsart
Kommentar zur Publikation
Allianzlizenz
Corresponding Authors der Uni Konstanz vorhanden
Internationale Co-Autor:innen
Universitätsbibliographie
Begutachtet
Diese Publikation teilen