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Surfactant-free emulsion polymerization : a comparative study
Thesis (MSc)--University of Stellenbosch, 1998.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613881650642944 |
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| access_status_str | Open Access |
| author | Bezuidenhout, Marthinus Eduard |
| author2 | Sanderson, R.D. |
| author_browse | Bezuidenhout, Marthinus Eduard Sanderson, R.D. |
| author_facet | Sanderson, R.D. Bezuidenhout, Marthinus Eduard |
| author_sort | Bezuidenhout, Marthinus Eduard |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MSc)--University of Stellenbosch, 1998. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/55982 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:43:11.727Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/55982 Surfactant-free emulsion polymerization : a comparative study Bezuidenhout, Marthinus Eduard Sanderson, R.D. Stellenbosch University. Faculty of Science. Dept. of Chemistry and Polymer Science. Emulsion polymerization Surface active agents Anionic polymerization Polyzwitterions UCTD Thesis (MSc)--University of Stellenbosch, 1998. ENGLISH ABSTRACT: This comparative study concerns the synthesis, characterization and determination of the stability of two emulsion latices prepared without the addition of conventional adsorbable surfactants. Stability of the latices was achieved by the incorporation of surface-active comonomers, also referred to as polymerizable surfactants. The first system, which represents the commercial class of surfactants free latices was stabilized by incorporation of an anionic monomer. The second system representing a recently novel class of latices was stabilized with zwitterionic sulphobetaine monomer. For the synthesis of the latices a semi-continuous starved-feed method was used. The latices were used ia further study to determine the influence of ionic strength on their colloidal stabilities. The stabilities are discussed in in terms of the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory involving a complete mathematical analysis of the diffuse electric double layer around the latex particles. The stability factor was incorporated to determine the diffuse potentials and the Hamaker constants of the electrical double layers. AFRIKAANSE OPSOMMING: 'n Vergelykende studie is onderneem op die sintese, karakterisering en die bepaling van die stabiliteite van twee emulsie sisteme wat berei is sonder enige konvensionele adsorbeerbare emulsifiseerders. Stabiele is verky duer gerbuik te maak van oppervlak-aktiewe komonomere, waarna ook verwys word as polimeriseerbare emulsifiseerders. Die een emulsie sisteem is gestabiliseer met behulp van ‘n anioniese komonomeer, en verteenwoordig die kommesiele kias van seepvrye. Die tweede sisteem wat ‘s nuwe klas van seepvrye emulsies verteenwoordig is gestabliseer met ‘n zwitterioniese selfbetaien as komonomeer. Die semi-kontinueeerlike metode van gebrekkige toevoeging is gevolg vir die sintese van die emulsies. Die eerste sisteem, wat die kommersiële klas van oppervlakaktiewe vrye lateks verteenwoordig, is gestabiliseer deur inkorporering van 'n anioniese monomeer. Die tweede sisteem wat 'n onlangs nuwe klas lateks verteenwoordig, is gestabiliseer met zwitterioniese sulfobetaïenmonomeer. Vir die sintese van die latises is 'n semi-kontinue uitgehonger-voer metode gebruik. Die lateise is onder meer gebruik om die invloed van ioniese sterkte op hul kolloïdale stabiliteit te bepaal. Die stabiliteite word bespreek in terme van die klassieke Derjaguin-Landau-Verwey-Overbeek (DLVO) teorie wat 'n volledige wiskundige analise van die diffuse elektriese dubbellaag rondom die latexdeeltjies behels. Die stabiliteitsfaktor is geïnkorporeer om die diffuse potensiale en die Hamaker-konstantes van die elektriese dubbellae te bepaal. 2012-08-27T11:37:19Z 2012-08-27T11:37:19Z 1998-03 Thesis http://hdl.handle.net/10019.1/55982 en_ZA Stellenbosch University 89 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Emulsion polymerization Surface active agents Anionic polymerization Polyzwitterions UCTD Bezuidenhout, Marthinus Eduard Surfactant-free emulsion polymerization : a comparative study |
| title | Surfactant-free emulsion polymerization : a comparative study |
| title_full | Surfactant-free emulsion polymerization : a comparative study |
| title_fullStr | Surfactant-free emulsion polymerization : a comparative study |
| title_full_unstemmed | Surfactant-free emulsion polymerization : a comparative study |
| title_short | Surfactant-free emulsion polymerization : a comparative study |
| title_sort | surfactant free emulsion polymerization a comparative study |
| topic | Emulsion polymerization Surface active agents Anionic polymerization Polyzwitterions UCTD |
| url | http://hdl.handle.net/10019.1/55982 |
| work_keys_str_mv | AT bezuidenhoutmarthinuseduard surfactantfreeemulsionpolymerizationacomparativestudy |