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The fractionation and characterisation of propylene-ethylene random copolymers
Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2005.
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : University of Stellenbosch
2008
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| _version_ | 1867614005958279168 |
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| access_status_str | Open Access |
| author | Harding, Gareth |
| author2 | Van Reenen, A. J. |
| author_browse | Harding, Gareth Van Reenen, A. J. |
| author_facet | Van Reenen, A. J. Harding, Gareth |
| author_sort | Harding, Gareth |
| collection | Thesis |
| dc_rights_str_mv | University of Stellenbosch |
| description | Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2005. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/3123 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:45:09.986Z |
| 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:10019.1/3123 The fractionation and characterisation of propylene-ethylene random copolymers Harding, Gareth Van Reenen, A. J. University of Stellenbosch. Faculty of Science. Dept. of Chemistry and Polymer Science. Polypropylene Polyethylene Polymers separation Polymers analysis Dissertations -- Polymer science Theses -- Polymer science Chemistry and Polymer Science Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2005. This study involves the fractionation and characterisation of three propyleneethylene random copolymers. The fractionation technique used in the study was temperature rising elution fractionation (TREF). The TREF fractions were subsequently analysed offline by crystallisation analysis fractionation (CRYSTAF), differential scanning calorimetry (DSC), 13C NMR, high-temperature gel-permeation chromatography (HT-GPC), and wide-angle x-ray diffraction (WAXD). The effect of the ethylene comonomer on the crystallisability of the propylene was investigated, along with the effect of the comonomer on the type of crystal phase formed during the crystallisation. The results show that the comonomer inhibits the crystallisation of the copolymer and that as the ethylene content increases, the crystallisation and melting points decrease. It was also shown that the higher the ethylene content, the more of the γ-phase crystal type is formed. The distribution of the comonomer throughout the copolymers was also investigated. The results show that there is an uneven distribution of the comonomer with most of the comonomer accumulating in the amorphous areas, and very little actually being incorporated in the crystalline regions. It was also observed that the fractions eluting at the highest temperatures had considerably higher polydispersities and lower molecular weights than the fractions eluting just before them. The highest temperature fractions also have lower melting and crystallisation temperatures than the preceding fractions. This has been attributed to a nucleation effect by the sand support used during the TREF fractionation. 2008-07-14T12:08:29Z 2010-06-01T09:06:53Z 2008-07-14T12:08:29Z 2010-06-01T09:06:53Z 2005-12 Thesis http://hdl.handle.net/10019.1/3123 en University of Stellenbosch application/pdf Stellenbosch : University of Stellenbosch |
| spellingShingle | Polypropylene Polyethylene Polymers separation Polymers analysis Dissertations -- Polymer science Theses -- Polymer science Chemistry and Polymer Science Harding, Gareth The fractionation and characterisation of propylene-ethylene random copolymers |
| title | The fractionation and characterisation of propylene-ethylene random copolymers |
| title_full | The fractionation and characterisation of propylene-ethylene random copolymers |
| title_fullStr | The fractionation and characterisation of propylene-ethylene random copolymers |
| title_full_unstemmed | The fractionation and characterisation of propylene-ethylene random copolymers |
| title_short | The fractionation and characterisation of propylene-ethylene random copolymers |
| title_sort | fractionation and characterisation of propylene ethylene random copolymers |
| topic | Polypropylene Polyethylene Polymers separation Polymers analysis Dissertations -- Polymer science Theses -- Polymer science Chemistry and Polymer Science |
| url | http://hdl.handle.net/10019.1/3123 |
| work_keys_str_mv | AT hardinggareth thefractionationandcharacterisationofpropyleneethylenerandomcopolymers AT hardinggareth fractionationandcharacterisationofpropyleneethylenerandomcopolymers |