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An investigation of the effect of chain length on stereo-regulation with 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_ | 1867613763594616832 |
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| access_status_str | Open Access |
| author | Amer, Ismael |
| author2 | Van Reenen, A. J. |
| author_browse | Amer, Ismael Van Reenen, A. J. |
| author_facet | Van Reenen, A. J. Amer, Ismael |
| author_sort | Amer, Ismael |
| 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:10019.1/3003 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:41:19.170Z |
| 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:10019.1/3003 An investigation of the effect of chain length on stereo-regulation with C2 symmetric metallocene catalysts Amer, Ismael Van Reenen, A. J. University of Stellenbosch. Faculty of Science. Dept. of Chemistry and Polymer Science. Dissertations -- Polymer science Theses -- Polymer science Metallocene catalysts Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2006. This study concerns the polymerization of propylene both in the presence and absence of molecular hydrogen. The percentage of hydrogen used as a terminating agent in the polymerization reactions was varied from 0.1 wt% to 15.0 wt% in order to compare a variety of polymers with different percentages of hydrogen incorporated. Two ansa metallocene catalysts were used: (A) rac-[ethylene bis(indenyl)] zirconium dichloride (rac-Et(Ind)2ZrCl2) and (B) dimethylsilyl-bis(2-methyl benzoindenyl) zirconium dichloride (rac-Me2Si(2-MeBenz[e]Ind)2ZrCl2). Methylaluminoxane (MAO) was used as cocatalyst for both of the two catalysts. Characterization of the polymers included using nuclear magnetic resonance spectroscopy (NMR) for information concerning the microstructure of the polymers, high temperature gel permeation chromatography (HT-GPC) for molecular weight and molecular weight distributions and differential scanning calorimetry (DSC) to investigate the melting point and crystallization behaviour of the polymers. The polypropylenes prepared with the dimethylsilyl-bis(2-methyl benzoindenyl) zirconium dichloride catalyst system were compared to the polypropylenes synthesized with ethylene-bis(indenyl) zirconium dichloride. In particular, the effects of hydrogen on the microstructure, molecular weight, molecular weight distribution, melting point and crystallization behaviour were investigated. 2008-01-22T09:26:04Z 2010-06-01T09:03:39Z 2008-01-22T09:26:04Z 2010-06-01T09:03:39Z 2006-12 Thesis http://hdl.handle.net/10019.1/3003 en University of Stellenbosch 12624231 bytes application/pdf application/pdf Stellenbosch : University of Stellenbosch |
| spellingShingle | Dissertations -- Polymer science Theses -- Polymer science Metallocene catalysts Amer, Ismael An investigation of the effect of chain length on stereo-regulation with C2 symmetric metallocene catalysts |
| title | An investigation of the effect of chain length on stereo-regulation with C2 symmetric metallocene catalysts |
| title_full | An investigation of the effect of chain length on stereo-regulation with C2 symmetric metallocene catalysts |
| title_fullStr | An investigation of the effect of chain length on stereo-regulation with C2 symmetric metallocene catalysts |
| title_full_unstemmed | An investigation of the effect of chain length on stereo-regulation with C2 symmetric metallocene catalysts |
| title_short | An investigation of the effect of chain length on stereo-regulation with C2 symmetric metallocene catalysts |
| title_sort | investigation of the effect of chain length on stereo regulation with c2 symmetric metallocene catalysts |
| topic | Dissertations -- Polymer science Theses -- Polymer science Metallocene catalysts |
| url | http://hdl.handle.net/10019.1/3003 |
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