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Synthesis and characterization of surfmers for latex stabilization in RAFT-mediated miniemulsion polymerization
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_ | 1867613931042766848 |
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| access_status_str | Open Access |
| author | Matahwa, Howard |
| author2 | Sanderson, R. D. |
| author_browse | Matahwa, Howard Sanderson, R. D. |
| author_facet | Sanderson, R. D. Matahwa, Howard |
| author_sort | Matahwa, Howard |
| 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:10019.1/2946 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:43:58.501Z |
| 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:10019.1/2946 Synthesis and characterization of surfmers for latex stabilization in RAFT-mediated miniemulsion polymerization Matahwa, Howard Sanderson, R. D. University of Stellenbosch. Faculty of Science. Dept. of Chemistry and Polymer Science. Addition polymerization RAFT polymerization Dissertations -- Polymer science Theses -- Polymer science Chemistry and Polymer Science Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2005. Synthesis of two surfmers (cationic and anionic) was carried out and the surfmers were used to stabilize particles in miniemulsion polymerization. Surfmers were used to eliminate adverse effects associated with free surfactant in the final product e.g. films and coatings. The Reversible Addition Fragmentation chain Transfer (RAFT) polymerization process was used in miniemulsion polymerization reactions to control the molecular weight distribution. RAFT offers a number of advantages that include its compatibility with a wide range of monomers and solvents. Moreover block copolymer synthesis is possible via chain extension. A comparative study between classical surfactants and surfmers was conducted in regard to reaction rates and molar mass distribution. The rates of reactions of surfmer stabilized RAFT miniemulsion polymerization of Styrene and MMA were similar (in most cases) to classical surfactant stabilized RAFT miniemulsion polymerization reactions. The final particle sizes were also similar for polystyrene latexes stabilized by surfmers and classical surfactants. However PMMA latexes stabilized by surfmers had larger particle sizes compared to latexes stabilized by classical surfactants. The surfmers were also oligomerized in homogeneous media using the RAFT process and their Mn values were estimated using UV-VIS spectroscopy. The oligosurfmers were then used as emulsifiers in RAFT miniemulsion polymerization. The rates of reaction were slower than rates obtain when the surfmers (monomer or oligosurfmers) were used directly as emulsifiers in RAFT miniemulsion polymerization of styrene and MMA. The final latex particle sizes obtained with oligosurfmers were also larger than that of latex stabilized by their parent monomers. The RAFT process was successfully applied in miniemulsion polymerization in both classical surfactant and surfmer stabilized miniemulsions. The molecular weight increased with conversion showing that the molecular weights of the polymers were controlled. 2008-07-21T08:58:49Z 2010-06-01T09:02:13Z 2008-07-21T08:58:49Z 2010-06-01T09:02:13Z 2005-12 Thesis http://hdl.handle.net/10019.1/2946 en University of Stellenbosch application/pdf Stellenbosch : University of Stellenbosch |
| spellingShingle | Addition polymerization RAFT polymerization Dissertations -- Polymer science Theses -- Polymer science Chemistry and Polymer Science Matahwa, Howard Synthesis and characterization of surfmers for latex stabilization in RAFT-mediated miniemulsion polymerization |
| title | Synthesis and characterization of surfmers for latex stabilization in RAFT-mediated miniemulsion polymerization |
| title_full | Synthesis and characterization of surfmers for latex stabilization in RAFT-mediated miniemulsion polymerization |
| title_fullStr | Synthesis and characterization of surfmers for latex stabilization in RAFT-mediated miniemulsion polymerization |
| title_full_unstemmed | Synthesis and characterization of surfmers for latex stabilization in RAFT-mediated miniemulsion polymerization |
| title_short | Synthesis and characterization of surfmers for latex stabilization in RAFT-mediated miniemulsion polymerization |
| title_sort | synthesis and characterization of surfmers for latex stabilization in raft mediated miniemulsion polymerization |
| topic | Addition polymerization RAFT polymerization Dissertations -- Polymer science Theses -- Polymer science Chemistry and Polymer Science |
| url | http://hdl.handle.net/10019.1/2946 |
| work_keys_str_mv | AT matahwahoward synthesisandcharacterizationofsurfmersforlatexstabilizationinraftmediatedminiemulsionpolymerization |