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Solution isomerization of commercial C2-symmetric metallocene catalysts
Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2006.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Stellenbosch : University of Stellenbosch
2008
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| _version_ | 1867614115056320512 |
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| access_status_str | Open Access |
| author | Soltan, Omar |
| author2 | Van Reenen, A. J. |
| author_browse | Soltan, Omar Van Reenen, A. J. |
| author_facet | Van Reenen, A. J. Soltan, Omar |
| author_sort | Soltan, Omar |
| collection | Thesis |
| dc_rights_str_mv | University of Stellenbosch |
| description | Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2006. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/2856 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:46:54.487Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2008 |
| publishDateRange | 2008 |
| publishDateSort | 2008 |
| publisher | Stellenbosch : University of Stellenbosch |
| publisherStr | Stellenbosch : University of Stellenbosch |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/2856 Solution isomerization of commercial C2-symmetric metallocene catalysts Soltan, Omar Van Reenen, A. J. University of Stellenbosch. Faculty of Science. Dept. of Chemistry and Polymer Science. Metallocene catalysts Isomerization Dissertations -- Polymer science Theses -- Polymer science Chemistry and Polymer Science Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2006. This study concerns the investigation of the isomerization of different metallocene catalysts in solution, and the effects thereof on the microstructure of polypropylenes prepared with these catalysts. Two C2 symmetric ansa metallocenes, ethylene-bis(indenyl) zirconium dichloride (EI) and dimethylsilyl-bis(2-methyl benzoindenyl) zirconium dichloride (MBI) were exposed, in solution, to both sunlight and UV radiation. The rac-meso isomerization of these catalysts were followed by 1H NMR spectroscopy. The reaching of a photostationary state is described, as well as the effect of isomerization of these catalysts in solution on the polymerization of propylene. Results show that metallocene structure has an effect on the isomerization rate and photostationary state. Results also show that the wavelength of light plays a role in the isomerization process. Effects on stereochemistry and molecular weight of the formed polymer as well as the catalyst activity is described and discussed. In addition the effect of activating the catalysts with MAO before exposure to light is discussed. 2008-07-31T07:48:08Z 2010-06-01T09:00:05Z 2008-07-31T07:48:08Z 2010-06-01T09:00:05Z 2006-03 Thesis http://hdl.handle.net/10019.1/2856 en University of Stellenbosch application/pdf Stellenbosch : University of Stellenbosch |
| spellingShingle | Metallocene catalysts Isomerization Dissertations -- Polymer science Theses -- Polymer science Chemistry and Polymer Science Soltan, Omar Solution isomerization of commercial C2-symmetric metallocene catalysts |
| title | Solution isomerization of commercial C2-symmetric metallocene catalysts |
| title_full | Solution isomerization of commercial C2-symmetric metallocene catalysts |
| title_fullStr | Solution isomerization of commercial C2-symmetric metallocene catalysts |
| title_full_unstemmed | Solution isomerization of commercial C2-symmetric metallocene catalysts |
| title_short | Solution isomerization of commercial C2-symmetric metallocene catalysts |
| title_sort | solution isomerization of commercial c2 symmetric metallocene catalysts |
| topic | Metallocene catalysts Isomerization Dissertations -- Polymer science Theses -- Polymer science Chemistry and Polymer Science |
| url | http://hdl.handle.net/10019.1/2856 |
| work_keys_str_mv | AT soltanomar solutionisomerizationofcommercialc2symmetricmetallocenecatalysts |