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Metallocene and Ziegler-Natta catalyzed polypropylene utilizing 1-heptene
Thesis (MSc)--Stellenbosch University, 2001.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613854397104128 |
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| access_status_str | Open Access |
| author | Lutz, Marietjie |
| author2 | Van Reenen, A. J. |
| author_browse | Lutz, Marietjie Van Reenen, A. J. |
| author_facet | Van Reenen, A. J. Lutz, Marietjie |
| author_sort | Lutz, Marietjie |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MSc)--Stellenbosch University, 2001. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/52334 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:42:44.343Z |
| 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:10019.1/52334 Metallocene and Ziegler-Natta catalyzed polypropylene utilizing 1-heptene Lutz, Marietjie Van Reenen, A. J. Stellenbosch University. Faculty of Science. Dept. of Chemistry and Polymer Sciences. Polymerization Propene Metallocene catalysts Dissertations -- Polymer science Thesis (MSc)--Stellenbosch University, 2001. ENGLISH ABSTRACT: This study concerns the copolymerization of propylene with l-heptene. The percentage of l-heptene used as co-monomer in the polymerization reactions was varied from 5% to 20% in order to compare a variety of polymers with different percentages of comonomer incorporated. A variety of different catalysts were used for these polymerizations. Two metallocene catalysts were used: (A) the isospecific catalyst, rae- [ethylene bis(l-indenyl)]zirconium dichloride (rac-Et(Ind)2ZrCh2) and (B) the silylene-bridged catalyst, rac-Me2Si(2-MeBenz[ e]Ind)zZrCh2. Methylaluminoxane (MAO) was used as cocatalyst for these two metallocene catalysts. Another series of polymerization reactions was done using a Ziegler-Natta catalyst, namely TiCb/AlEt3/Si02. Characterization of the copolymers included usmg high temperature gel permeation chromatography (HTGPC) for molecular mass and molecular mass distributions, differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) to investigate the thermal and mechanical properties of the copolymers, nuclear magnetic resonance spectroscopy (NMR) for information concerning the microstructures of the copolymers and crystallization analysis fractionation (CRYSTAF) to investigate the short chain branching of the copolymers. Comparative studies were done on the different catalysts and the polymer properties. The synthesized polymers were also compared with copolymers of propylene with l-hexene and l-octene. AFRIKAANSE OPSOMMING: Hierdie studie behels die kopolimerisasie van propileen met I-hepteen. Die persentasie van I-hepteen wat as komonomeer in die polimerisasie-reaksies gebruik is, is van 5% tot 20% gevarieer. 'n Verskeidenheid van verskillende kataliste is gebruik vir hierdie polimerisasies. Twee metalloseenkataliste is gebruik: (A) die isospesifieke katalis, rae- [etileen bis(l-indeniel)]zirconium dichloried (rac-Et(lnd)2ZrCh2) en (B) die silileengebrugde katalis, rac-Me2Si(2-MeBenz[e]Ind)2ZrCh2. Metielaluminoksaan (MAO) is as ko-katalis gebruik saam met bogenoemde twee metalloseenkataliste. 'n Ander reeks polimerisasie reaksies is gedoen waarin 'n Ziegler-Natta katalis gebruik is as aktiverende katalis, naamlik TiCi)/ AlEt3/Si02. Die karakterisering van die kopolimere sluit in: hoë temperatuur gel deurlatings chromatrografie (HTGPC) vir molekulêre massa en molekulêre massa verspreidings, differensiële skandering kalorimetrie (DSC) en dinamiese meganiese analisering (DMA) om sodoende die termiese en meganiese eienskappe van die polimere te ondersoek, kern magnetiese resonans spektroskopie (KMR) vir inligting in verband met die mikrostrukture van die kopolimere en kristallisasie analise fraksioneringstegniek (CRYSTAF) om die kort-kettingvertakkings van die kopolimere te ondersoek. Vergelykende studies IS op die verskillende katalisatore en die polimeereienskappe gedoen. Die gesintetiseerde polimere is ook met kopolimere van propileen met I-hekseen en l-okteen vergelyk. 2012-08-27T11:34:57Z 2012-08-27T11:34:57Z 2001-12 Thesis http://hdl.handle.net/10019.1/52334 en_ZA Stellenbosch University 162 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Polymerization Propene Metallocene catalysts Dissertations -- Polymer science Lutz, Marietjie Metallocene and Ziegler-Natta catalyzed polypropylene utilizing 1-heptene |
| title | Metallocene and Ziegler-Natta catalyzed polypropylene utilizing 1-heptene |
| title_full | Metallocene and Ziegler-Natta catalyzed polypropylene utilizing 1-heptene |
| title_fullStr | Metallocene and Ziegler-Natta catalyzed polypropylene utilizing 1-heptene |
| title_full_unstemmed | Metallocene and Ziegler-Natta catalyzed polypropylene utilizing 1-heptene |
| title_short | Metallocene and Ziegler-Natta catalyzed polypropylene utilizing 1-heptene |
| title_sort | metallocene and ziegler natta catalyzed polypropylene utilizing 1 heptene |
| topic | Polymerization Propene Metallocene catalysts Dissertations -- Polymer science |
| url | http://hdl.handle.net/10019.1/52334 |
| work_keys_str_mv | AT lutzmarietjie metalloceneandzieglernattacatalyzedpolypropyleneutilizing1heptene |