Investigation of molecular weight effects during the solution crystallisation of polyolefins

Simple item page
dc.contributor.advisorVan Reenen, A. J.
dc.contributor.authorBrand, M.en_ZA
dc.contributor.otherUniversity of Stellenbosch. Faculty of Science. Dept. of Chemistry and Polymer Science.
dc.date.accessioned2008-06-11T13:17:17Zen_ZA
dc.date.accessioned2010-06-01T09:01:03Z
dc.date.available2008-06-11T13:17:17Zen_ZA
dc.date.available2010-06-01T09:01:03Z
dc.date.issued2008-03en_ZA
dc.descriptionThesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2008.
dc.description.abstractThis 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.en_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/2896
dc.language.isoenen_ZA
dc.publisherStellenbosch : University of Stellenbosch
dc.rights.holderUniversity of Stellenbosch
dc.subjectSolution crystallisationen_ZA
dc.subjectMolecular weight effectsen_ZA
dc.subjectPolyolefinsen_ZA
dc.subjectDissertations -- Polymer scienceen_ZA
dc.subjectTheses -- Polymer scienceen_ZA
dc.subject.otherChemistry and Polymer Scienceen_ZA
dc.titleInvestigation of molecular weight effects during the solution crystallisation of polyolefinsen_ZA
dc.typeThesisen_ZA
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
brand_investigation_2008.pdf
Size:
3.85 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
Masters Degrees (Chemistry and Polymer Science)