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Metallocene catalyzed branched polyolefin copolyners
Thesis (M.Sc.) -- University of Stellenbosch, 1999.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613893495357440 |
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| access_status_str | Open Access |
| author | Geldenhuys, Monja |
| author2 | Sanderson, R. D. |
| author_browse | Geldenhuys, Monja Sanderson, R. D. |
| author_facet | Sanderson, R. D. Geldenhuys, Monja |
| author_sort | Geldenhuys, Monja |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (M.Sc.) -- University of Stellenbosch, 1999. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/51339 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:43:23.129Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/51339 Metallocene catalyzed branched polyolefin copolyners Geldenhuys, Monja Sanderson, R. D. Brall, R. Stellenbosch University. Faculty of Science. Dept. of Chemistry & Polymer Science. Polymerization Ethylene Propene Metallocene catalysts Dissertations -- Polymer science Thesis (M.Sc.) -- University of Stellenbosch, 1999. ENGLISH ABSTRACT: This study concerns the copolymerization of ethylene and propylene with I-pentene using metallocene-based zirconium catalysts. A thorough study on the background of the copolymerizations of I-pentene with ethylene and propylene was done. The metallocene catalyst that was used in the copolymerization of ethylene with I-pentene was the isospecific rac-[ethylene bis(l-indenyl)]zirconium dichloride (rac-Et(Ind)2ZrCl2) catalyst, and in the copolymerization of propylene with I-pentene the silylene-bridged catalyst, rac-Me2Si(2-MeBenz[e]Ind)2ZrCl2. Methylalumoxane (MAO) was used as cocatalyst in all the polymerizations. Characterization of these copolymers included determinations of the thermal properties, microstructures, molecular masses and molecular mass distributions. In particular the relationship of the amount of I-pentene incorporated in the copolymers on the thermal properties was investigated. The short-chain branching of these copolymers was investigated by crystallization analysis fractionation (CRYSTAF). AFRIKAANSE OPSOMMING: Hierdie studie behels die kopolimerisasie van etileen en propileen met I-pentene deur van homogene metalloseenkatalisatore gebruik te maak. 'n Deeglike studie oor die agtergrond van die kopolimerisasie reaksies van I-pentene met etileen en propileen is gedoen. Die metalloseenkatalisatore wat gebruik is vir die kopolimerisasie van etileen met I-penteen en propileen met I-penteen is die isospesifieke rac-[etileen bis(l-indeniel)] zirkonium dichloried (rac-Et(Ind)2ZrCl2) katalisator en die silileen-gebrugde katalisator, rac-Me2Si(2-MeBenz[e]Ind)2ZrCl2, respektiewelik. Metielalumoksaan (MAO) is as ko-katalisator in al die polimerisasie reaksies gebruik. Karakterisering van die kopolimere het die berekening van die termiese eienskappe, mikrostrukture, molekulere massas en molekulere massa verspreidings behels. Daar is veral gekyk na die invloed van die hoeveelheid I-penteen geinkorporeer op die termiese eienskappe van die kopolimeer. Die kort-kettingvertakkings van die kopolimere is ondersoek deur die kristallisasie analise fraktioneringstegniek (CRYSTAF). Master 2012-08-27T11:34:27Z 2012-08-27T11:34:27Z 1999-12 Thesis http://hdl.handle.net/10019.1/51339 en_ZA Stellenbosch University 151 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Polymerization Ethylene Propene Metallocene catalysts Dissertations -- Polymer science Geldenhuys, Monja Metallocene catalyzed branched polyolefin copolyners |
| title | Metallocene catalyzed branched polyolefin copolyners |
| title_full | Metallocene catalyzed branched polyolefin copolyners |
| title_fullStr | Metallocene catalyzed branched polyolefin copolyners |
| title_full_unstemmed | Metallocene catalyzed branched polyolefin copolyners |
| title_short | Metallocene catalyzed branched polyolefin copolyners |
| title_sort | metallocene catalyzed branched polyolefin copolyners |
| topic | Polymerization Ethylene Propene Metallocene catalysts Dissertations -- Polymer science |
| url | http://hdl.handle.net/10019.1/51339 |
| work_keys_str_mv | AT geldenhuysmonja metallocenecatalyzedbranchedpolyolefincopolyners |