| |  Online-Ressource |
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| Verfasst von: | Kurek, Alexander Gerhard [VerfasserIn]  |
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| | Mark, Stefan [VerfasserIn] |
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| | Enders, Markus [VerfasserIn] |
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| | Stürzel, Markus Roland [VerfasserIn] |
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| | Mülhaupt, Rolf [VerfasserIn] |
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| Titel: | Two-site silica supported Fe/Cr catalysts for tailoring bimodal polyethylenes with variable content of UHMWPE |
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| Verf.angabe: | Alexander Kurek, Stefan Mark, Markus Enders, Markus Stürzel, Rolf Mülhaupt |
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| Jahr: | 2014 |
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| Jahr des Originals: | 2013 |
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| Umfang: | 5 S. |
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| Fussnoten: | Online 24 November 2013 ; Gesehen am 16.09.2020 |
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| Titel Quelle: | Enthalten in: Journal of molecular catalysis / A |
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| Ort Quelle: | Amsterdam [u.a.] : Elsevier Science, 1994 |
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| Jahr Quelle: | 2014 |
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| Band/Heft Quelle: | 383-384(2014), Seite 53-57 |
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| Abstract: | A new family of silica supported two-site Fe/Cr catalysts were prepared by means of sequential and simultaneous immobilization (“cosupporting”) of both 2,6-bis-[1-(2,6-dimethylphenyliminio)ethyl]pyridine iron(II) chloride (Fe) and η5-[3,4,5-trimethyl-1-(8-quinolyl)-2-trimethyl-silylcyclopentadienyl]chromium(III) chloride (Cr) on MAO-pretreated silica. The influence of catalyst preparation, catalyst composition, and of Fe/Cr molar ratio on catalyst activity, polyethylene (PE) molecular weight (MW), and PE molecular weight distribution (MWD), as determined by high temperature size exclusion chromatography, was examined. Catalyst activity increased with decreasing transition metal content. The average molar masses of the two PE fractions, UHMWPE (3×106g/mol), produced on Cr sites, and PE (3×105g/mol), produced on Fe sites, are independent of the Fe/Cr molar ratio. The sequential immobilization of the Fe complex prior to the Cr complex affords the highest catalyst activities and highest UHMWPE contents. Here, the UHMWPE content consequently increases from 0 to 32wt% with increasing Cr content at constant Fe concentration. |
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| DOI: | doi:10.1016/j.molcata.2013.11.020 |
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| URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Volltext ; Verlag: https://doi.org/10.1016/j.molcata.2013.11.020 |
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| | Volltext: http://www.sciencedirect.com/science/article/pii/S1381116913004421 |
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| | DOI: https://doi.org/10.1016/j.molcata.2013.11.020 |
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| Datenträger: | Online-Ressource |
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| Sprache: | eng |
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| Sach-SW: | Bimodal molar mass distribution |
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| | Ethylene polymerization |
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| | Post-metallocene |
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| | Single-site catalyst |
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| | Supported catalyst |
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| | Ultrahigh molecular weight polyethylene |
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| K10plus-PPN: | 1733105352 |
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| Verknüpfungen: | → Zeitschrift |
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Two-site silica supported Fe/Cr catalysts for tailoring bimodal polyethylenes with variable content of UHMWPE / Kurek, Alexander Gerhard [VerfasserIn]; 2014 (Online-Ressource)
