Publikation:

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

Vorschaubild

Dateien

Juengling_240629.pdf
Juengling_240629.pdfGröße: 3.74 MBDownloads: 846

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

URI (zitierfähiger Link)
http://nbn-resolving.de/urn:nbn:de:bsz:352-240629
DOI (zitierfähiger Link)
https://doi.org/10.1002/masy.19950970121
ArXiv-ID

Internationale Patentnummer

Link zur Lizenz
Urheberrechtlich geschützt

Angaben zur Forschungsförderung

Projekt

Open Access-Veröffentlichung
Open Access Green

Sammlungen

Chemie: Publikationen
Core Facility der Universität Konstanz

Gesperrt bis

Titel in einer weiteren Sprache

Publikationstyp
Zeitschriftenartikel
Publikationsstatus
Published

Erschienen in

Macromolecular Symposia. 1995, 97(1), pp. 205-216. ISSN 1022-1360. eISSN 1521-3900. Available under: doi: 10.1002/masy.19950970121

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

Forschungsvorhaben

Organisationseinheiten

Zeitschriftenheft

Zugehörige Datensätze in KOPS

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