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The grafting and chemical modification of epoxidized natural rubber
Thesis (M.Sc) -- University of Stelllenbosch,1999.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613985203814400 |
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| access_status_str | Open Access |
| author | Vermeulen, Johannes Petrus |
| author2 | Sanderson, R. D. |
| author_browse | Sanderson, R. D. Vermeulen, Johannes Petrus |
| author_facet | Sanderson, R. D. Vermeulen, Johannes Petrus |
| author_sort | Vermeulen, Johannes Petrus |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (M.Sc) -- University of Stelllenbosch,1999. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/51483 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:44:50.018Z |
| 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:10019.1/51483 The grafting and chemical modification of epoxidized natural rubber Vermeulen, Johannes Petrus Sanderson, R. D. Stellenbosch University. Faculty of Science. Dept. of Chemistry & Polymer Science. Emulsion polymerization Polymerization Rubber Dissertations -- Polymer science Thesis (M.Sc) -- University of Stelllenbosch,1999. ENGLISH ABSTRACT: This study concerns the grafting and chemical modification of a commercially available epoxidized natural rubber (ENR50) by means of the emulsion polymerization technique. The following were investigated experimentally: three different techniques used for the emulsion polymerization process (batch, delayed addition of monomer and the pre-emulsion polymerization method), the influence of surfactant on the emulsion polymerization reaction, the compatibility of polymethyl methacrylate (PMMA) and polystyrene (PS) with the ENR50, the effect of acrylic and methacrylic acid on the compatibility of ENR50 and PMMA. A Dynamic Mechanical Analyzer (DMA) and Dielectric Analyzer (DEA) were used, simultaneously, for the analysis of the grafted ENR50 and the DMA was also used separately to evaluate the impact strength of the grafted material. Using the results of the investigations a series of grafted materials was synthesized in which different surfactant and ENR50 : MMA ratios were used. This study shows, conclusively, that the best grafting takes place in the reaction using the pre-emulsion polymerization method of MMA with ENR50 and that the simultaneous use of the DMA and DEA can be used as an analytical tool to fine-tune reaction conditions. AFRIKAANSE OPSOMMING: Die studie het betrekking op die enting en die chemiese modifikasie van 'n kommersieel beskikbare geepoksideerde natuurlike rubber (ENR50) deur middel van die emulsie polimerisasie tegniek. Die volgende is eksperimenteel ondersoek: drie verskillende tegnieke vir die emulsie polimerisasie proses (produksie, stelselmatige byvoeging van monomeer en die preemulsie polimerisasie metode), die invloed van seep op die emulsie polimerisasie reaksie, die verenigbaarheid van polimetiel-metakrilaat (PMMA) en polistireen (PS) met die ENR50, die effek van akrielsuur en metakrielsuur op die verenigbaarheid van ENR50 en PMMA. 'n Dinamiese Meganiese Analiseerder (DMA) en Dielektrikum Analiseerder (DEA) is gelyktydig gebruik vir die analise van die geente ENR50 terwyl die DMA ook apart gebruik is om die impak-krag van die geente materiaal te evalueer. Die resultate van die ondersoeke is gebruik om 'n reeks geente materiaal te sintetiseer waarin verskillende seep en ENR50 : MMA verhoudings gebruik is. Die studie bewys, onweerlegbaarl dat enting verkieslik tydens die reaksie plaasvind waar die pre-emulsie polimerisasie metode van MMA met ENRSO toegepas is en dat die gelyktydige gebruik van die DMA en DEA gebruik kan word as die analitiese instrument om die reaksie kondisies fyn in te stel. Master 2012-08-27T11:34:31Z 2012-08-27T11:34:31Z 1999-12 Thesis http://hdl.handle.net/10019.1/51483 en_ZA Stellenbosch University 121 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Emulsion polymerization Polymerization Rubber Dissertations -- Polymer science Vermeulen, Johannes Petrus The grafting and chemical modification of epoxidized natural rubber |
| title | The grafting and chemical modification of epoxidized natural rubber |
| title_full | The grafting and chemical modification of epoxidized natural rubber |
| title_fullStr | The grafting and chemical modification of epoxidized natural rubber |
| title_full_unstemmed | The grafting and chemical modification of epoxidized natural rubber |
| title_short | The grafting and chemical modification of epoxidized natural rubber |
| title_sort | grafting and chemical modification of epoxidized natural rubber |
| topic | Emulsion polymerization Polymerization Rubber Dissertations -- Polymer science |
| url | http://hdl.handle.net/10019.1/51483 |
| work_keys_str_mv | AT vermeulenjohannespetrus thegraftingandchemicalmodificationofepoxidizednaturalrubber AT vermeulenjohannespetrus graftingandchemicalmodificationofepoxidizednaturalrubber |