Synthesis and characterization of comb-polymers with controlled structure

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dc.contributor.advisorMallon, P. E.
dc.contributor.authorElhrari, Waelen_ZA
dc.contributor.otherUniversity of Stellenbosch. Faculty of Science. Dept. of Chemistry and Polymer Science.
dc.date.accessioned2008-01-31T08:04:08Zen_ZA
dc.date.accessioned2010-06-01T08:32:34Z
dc.date.available2008-01-31T08:04:08Zen_ZA
dc.date.available2010-06-01T08:32:34Z
dc.date.issued2006-12en_ZA
dc.descriptionThesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2006.
dc.description.abstractSynthesis of a series of poly (methylmethacrylate)-graft-poly (styrene) polymer was carried out via free radical polymerization of methylmethacrylate and polystyrene macromonomers. The macromonomers were synthesized via living anionic polymerization techniques. Two series of macromonomers where synthesized with different polymerizable end group functionalities, by termination with p-vinyl benzyl chloride and 3-(dimethyl chloro silyl) propyl methacrylate. The branch density was varied by controlling the composition feed ratio of the macromonomers to comonomer. Liquid chromatographic techniques were used to fully characterize the chemical composition and branch distributions of the graft polymer. Liquid chromatography under critical conditions of adsorption of styrene coupling with Fourier Transform Infrared Spectra was used to investigate the chemical composition and distribution of the branches in the graft. Physical properties of the graft copolymers such as Tg and free volume were determined using differential scanning calorimetry and positron lifetime spectrometry respectively. The relationship between the chemical composition and the graft copolymer properties such as Tg and free volume were investigated. The results show that for long chain macromonomers phase segregation occurs in the graft copolymers. In the case of shorter chain macromonomers at low content no phase segregation is observed and the macromonomers have an antiplasticization effect on the graft polymers.en_ZA
dc.format.extent1266269 bytesen_ZA
dc.format.mimetypeapplication/pdfen_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/1758
dc.language.isoenen_ZA
dc.publisherStellenbosch : University of Stellenbosch
dc.rights.holderUniversity of Stellenbosch
dc.subjectPolymersen_ZA
dc.subjectPolymerizationen_ZA
dc.subjectGraft copolymersen_ZA
dc.subjectAddition polymerizationen_ZA
dc.subjectDissertations -- Polymer scienceen_ZA
dc.subjectTheses -- Polymer scienceen_ZA
dc.subject.otherChemistry and Polymer Scienceen_ZA
dc.titleSynthesis and characterization of comb-polymers with controlled structureen_ZA
dc.typeThesisen_ZA
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