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Investigation of molecular weight effects during the solution crystallisation of polyolefins
Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2008.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Stellenbosch : University of Stellenbosch
2008
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| _version_ | 1867613919080611840 |
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| access_status_str | Open Access |
| author | Brand, M. |
| author2 | Van Reenen, A. J. |
| author_browse | Brand, M. Van Reenen, A. J. |
| author_facet | Van Reenen, A. J. Brand, M. |
| author_sort | Brand, M. |
| 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:10019.1/2896 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:43:47.401Z |
| 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:10019.1/2896 Investigation of molecular weight effects during the solution crystallisation of polyolefins Brand, M. Van Reenen, A. J. University of Stellenbosch. Faculty of Science. Dept. of Chemistry and Polymer Science. Solution crystallisation Molecular weight effects Polyolefins Dissertations -- Polymer science Theses -- Polymer science Chemistry and Polymer Science Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2008. This study involved (a) the development and testing of a solution turbidity fractionation analyser (TFA) and (b) the investigation of possible molecular weight effects on solution crystallisation. To investigate the latter highly isotactic polypropylene was polymerised with a C2 symmetric metallocene catalyst. Blends were made of these homopolymers. The homopolymers as well as the blends were fractionated by means of temperature rising elution fractionation (TREF). The fractionated and unfractionated homopolymers as well as the fractionated blends were characterised by 13C NMR, differential scanning calorimetry (DSC) and gel permeation chromatography (GPC). The TFA was successfully developed and helped in explaining the shifting of solution crystallisation temperature that was seen when blending of the homopolymers occurred. This was done performing analyses on the machine of blends of the homopolymers. Fractions, of the homopolymers and blends, obtained from TREF were also done. Subsequent runs of blends made from the fractions obtained from TREF were also done. In the end it was shown that the shift of the solution crystallisation temperature is either due to the tacticity or the molecular weight depending on the sample. 2008-06-11T13:17:17Z 2010-06-01T09:01:03Z 2008-06-11T13:17:17Z 2010-06-01T09:01:03Z 2008-03 Thesis http://hdl.handle.net/10019.1/2896 en University of Stellenbosch application/pdf Stellenbosch : University of Stellenbosch |
| spellingShingle | Solution crystallisation Molecular weight effects Polyolefins Dissertations -- Polymer science Theses -- Polymer science Chemistry and Polymer Science Brand, M. Investigation of molecular weight effects during the solution crystallisation of polyolefins |
| title | Investigation of molecular weight effects during the solution crystallisation of polyolefins |
| title_full | Investigation of molecular weight effects during the solution crystallisation of polyolefins |
| title_fullStr | Investigation of molecular weight effects during the solution crystallisation of polyolefins |
| title_full_unstemmed | Investigation of molecular weight effects during the solution crystallisation of polyolefins |
| title_short | Investigation of molecular weight effects during the solution crystallisation of polyolefins |
| title_sort | investigation of molecular weight effects during the solution crystallisation of polyolefins |
| topic | Solution crystallisation Molecular weight effects Polyolefins Dissertations -- Polymer science Theses -- Polymer science Chemistry and Polymer Science |
| url | http://hdl.handle.net/10019.1/2896 |
| work_keys_str_mv | AT brandm investigationofmolecularweighteffectsduringthesolutioncrystallisationofpolyolefins |