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The effect of molecular composition on the properties of linear low density polyethylene
Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2008.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : University of Stellenbosch
2008
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| _version_ | 1867613804598132736 |
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| access_status_str | Open Access |
| author | Keulder, L. |
| author2 | Van Reenen, A. J. |
| author_browse | Keulder, L. Van Reenen, A. J. |
| author_facet | Van Reenen, A. J. Keulder, L. |
| author_sort | Keulder, L. |
| collection | Thesis |
| dc_rights_str_mv | University of Stellenbosch |
| description | Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2008. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/2929 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:41:58.332Z |
| 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:10019.1/2929 The effect of molecular composition on the properties of linear low density polyethylene Keulder, L. Van Reenen, A. J. University of Stellenbosch. Faculty of Science. Dept. of Chemistry and Polymer Science. Linear low density polyethylene Mechanical properties Temperature rising elution fractionation (TREF) Molecular structure Dissertations -- Chemistry Theses -- Chemistry Chemistry and Polymer Science Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2008. In this study linear low density polyethylene (LLDPE), a copolymer consisting of ethylene and 1-butene, was fractionated by the use of temperature rising elution fractionation (TREF). These fractions were then analyzed by crystallisation analysis fractionation, 13C NMR, high temperature size exclusion chromatography and DSC. The molecular distribution of the polymer was investigated. It was found that the polymer had a very broad distribution in its chemical composition. From these results it was also clear that the catalysts used for the polymerisation consist out of different active sites, producing chains with different molecular architecture. Subsequently the polymer was fractionated again by TREF and certain fractions were removed and the remaining material recombined. The removed fractions and recombined material were analyzed by 13C NMR, high temperature size exclusion chromatography, DSC and DMA. The results were compared with the bulk material and from this we could conclude the influence of the fractions removed on the material properties. This gave us more information on the influence of the chemical structure of the polymer on its mechanical properties. It was clear that by removing certain fractions with a certain chemical composition, the properties of the polymer are significantly influenced. 2008-06-17T12:55:23Z 2010-06-01T09:01:50Z 2008-06-17T12:55:23Z 2010-06-01T09:01:50Z 2008-03 Thesis http://hdl.handle.net/10019.1/2929 en_ZA University of Stellenbosch application/pdf Stellenbosch : University of Stellenbosch |
| spellingShingle | Linear low density polyethylene Mechanical properties Temperature rising elution fractionation (TREF) Molecular structure Dissertations -- Chemistry Theses -- Chemistry Chemistry and Polymer Science Keulder, L. The effect of molecular composition on the properties of linear low density polyethylene |
| title | The effect of molecular composition on the properties of linear low density polyethylene |
| title_full | The effect of molecular composition on the properties of linear low density polyethylene |
| title_fullStr | The effect of molecular composition on the properties of linear low density polyethylene |
| title_full_unstemmed | The effect of molecular composition on the properties of linear low density polyethylene |
| title_short | The effect of molecular composition on the properties of linear low density polyethylene |
| title_sort | effect of molecular composition on the properties of linear low density polyethylene |
| topic | Linear low density polyethylene Mechanical properties Temperature rising elution fractionation (TREF) Molecular structure Dissertations -- Chemistry Theses -- Chemistry Chemistry and Polymer Science |
| url | http://hdl.handle.net/10019.1/2929 |
| work_keys_str_mv | AT keulderl theeffectofmolecularcompositiononthepropertiesoflinearlowdensitypolyethylene AT keulderl effectofmolecularcompositiononthepropertiesoflinearlowdensitypolyethylene |