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Multi-detector thermal field-flow fractionation (ThFFF) as a characterization technique for complex polymer self-assemblies
Thesis (MSc)--Stellenbosch University, 2017.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2017
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| _version_ | 1867614139688419328 |
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| access_status_str | Open Access |
| author | Muza, Upenyu Lucky |
| author2 | Pasch, Harald |
| author_browse | Muza, Upenyu Lucky Pasch, Harald |
| author_facet | Pasch, Harald Muza, Upenyu Lucky |
| author_sort | Muza, Upenyu Lucky |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MSc)--Stellenbosch University, 2017. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/100902 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:47:17.937Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/100902 Multi-detector thermal field-flow fractionation (ThFFF) as a characterization technique for complex polymer self-assemblies Muza, Upenyu Lucky Pasch, Harald Stellenbosch University. Faculty of Science. Dept. of Chemistry and Polymer Science. Polyethylene oxide Copolymers UCTD Amphiphilic compounds Thesis (MSc)--Stellenbosch University, 2017. ENGLISH ABSTRACT: Amphiphilic block copolymer micelles have found a niche in pharmaceutical, electronics, environmental, cosmetics and hygiene industries. These micelles, whether in the pure or mixed micelle form, often exist as multiple morphologies (spherical, cylindrical, worm or vesicular) in equilibrium with each other. However none of the current techniques can successfully separate and characterize these multiple morphologies with regards to size, molar mass, chemical composition and their respective distributions, in a single measurement. Thermal field-flow fractionation (ThFFF) is shown to be capable of separating and characterizing pure micelles prepared from two types of polystyrene - polyethylene oxide block copolymers (PS-PEO), of different PS block sizes but similar PEO block sizes. Moreover, multiple micelle morphologies induced by the addition of 1 mM LiBr, as well as multiple mixed micelles prepared from various binary blending protocols of the two PS-b-PEO copolymers were successfully characterized. In addition, ThFFF is shown to be capable of monitoring the dynamics of formation of the mixed micelles. AFRIKAANSE OPSOMMING: Amfifiliese blok ko-polimere het n nismark in verskeie farmaseutiese, elektroniese, kosmetiese, higiëniese asook in die omgewings industrië gevind. Miselles, suiwer of gemeng, bestaan gewoonlik in ewewig met verskeie morfologië soos bv. silindries, spheries of wurm. Tans is daar geen enkele analitiese tegniek wat hierdie verskeie morfologië kan skei in terme van groote, molekulêre massa en chemiese samestelling, of hul verspreidings, in n enkele analiese nie. Dit word gewys dat termiese veldvloeifraksionering (ThFFF) miselles, wat bestaan uit polistireen-blok-poli(etileenoksied) (PS-PEO) ko-polimere met verskeie PS blok lengtes maar selfde PEO blok lengtes, kan skei. Dit word ook gewys dat verkseie morfologië word gevorm in 1 milimolar litium bromide en dat hierdie morfologië, asook gemengde miselles wat berei is deur verskillende tegnieke, deur ThFFF gekarakteriseer kan word. Dit word ook gewys dat ThFFF gebruik kan word om die vormings dynamika van miselles te monitor. 2017-02-17T12:56:27Z 2017-03-29T11:44:21Z 2017-02-17T12:56:27Z 2017-03-29T11:44:21Z 2017-03 Thesis http://hdl.handle.net/10019.1/100902 en_ZA Stellenbosch University xix, 83 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Polyethylene oxide Copolymers UCTD Amphiphilic compounds Muza, Upenyu Lucky Multi-detector thermal field-flow fractionation (ThFFF) as a characterization technique for complex polymer self-assemblies |
| title | Multi-detector thermal field-flow fractionation (ThFFF) as a characterization technique for complex polymer self-assemblies |
| title_full | Multi-detector thermal field-flow fractionation (ThFFF) as a characterization technique for complex polymer self-assemblies |
| title_fullStr | Multi-detector thermal field-flow fractionation (ThFFF) as a characterization technique for complex polymer self-assemblies |
| title_full_unstemmed | Multi-detector thermal field-flow fractionation (ThFFF) as a characterization technique for complex polymer self-assemblies |
| title_short | Multi-detector thermal field-flow fractionation (ThFFF) as a characterization technique for complex polymer self-assemblies |
| title_sort | multi detector thermal field flow fractionation thfff as a characterization technique for complex polymer self assemblies |
| topic | Polyethylene oxide Copolymers UCTD Amphiphilic compounds |
| url | http://hdl.handle.net/10019.1/100902 |
| work_keys_str_mv | AT muzaupenyulucky multidetectorthermalfieldflowfractionationthfffasacharacterizationtechniqueforcomplexpolymerselfassemblies |