Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
The design, synthesis and characterization of neutral polymeric bonding agents
Thesis (M. Sc.) -- University of Stellenbosch, 1993.
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Stellenbosch : Stellenbosch University
2012
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613967094906880 |
|---|---|
| access_status_str | Open Access |
| author | Du Toit, Thomas |
| author2 | Van Reenen, A. J. |
| author_browse | Du Toit, Thomas Van Reenen, A. J. |
| author_facet | Van Reenen, A. J. Du Toit, Thomas |
| author_sort | Du Toit, Thomas |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (M. Sc.) -- University of Stellenbosch, 1993. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/58159 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:44:33.029Z |
| 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:10019.1/58159 The design, synthesis and characterization of neutral polymeric bonding agents Du Toit, Thomas Van Reenen, A. J. Sanderson, R. D. Stellenbosch University. Faculty of Science. Dept. of Chemistry & Polymer Science. Polymers Membranes (Technology) Dissertations -- Polymer science Thesis (M. Sc.) -- University of Stellenbosch, 1993. The surface modification of films, fibres and membranes may be approached in many ways. In this study the surface modification of membranes was approached in a novel way, namely via the synthesis of a neutral polymeric bonding agent for polysulphones. The principle of adhesion of the neutral polymeric bonding agent to a polysulphone substrate is based on the solubility parameter theory. The concept of solubility parameters is fully discussed, and several possible means of theoretical and experimental predictions evaluated. Relationships between the solubility parameter and the Flory-Huggins function, surface tension, solution viscosity, temperature and chromatographic data, are also reviewed. A copolymer (I) of acrylic acid/acrylonitrile was synthesised to match the solubility parameters of polyethersulphone (II) as reported in literature. The solubility parameters of polysulphone (III) were determined experimentally by the solvent spectrum method. Good agreement was found between the solubility parameter values as determined experimentally, theoretically and those quoted in literature. A terpolymer (IV) of styrene, acrylonitrile and methyl methacrylate was designed to match the solubility parameters of (III), and synthesised. The theoretical and experimentally determined solubility parameters of the terpolymer (IV) corresponded well with those of (III). However compatibility studies proved that (IV) and (III) were only partially compatible. The neutral polymeric bonding agent has to bond to the surface, but it must also create the desired surface characteristics on the polysulphone membrane. It was deemed possible to use the acrylonitrile groups present in (IV) as grafting sites for hydrophilic side chains. As a first stage poly(acrylonitrile) (V) was grafted with vinyl acetate via a thioamidation reaction. This grafting reaction was somewhat inefficient when attempted with (IV). A Light Intensity Thermal Analyser was also constructed. It consists of a light intensity sensor fitted to a hotstage microscope. The instrument allows for data smoothing, event differentiation and graphic display. The instrument is useful for determination of crystalline melting points, melting ranges, blend miscibility and composition, and critical solution temperature. As a low cost attachment to a light microscope, it can take over several functions of a DSC. Masters 2012-08-27T11:38:50Z 2012-08-27T11:38:50Z 1993 Thesis http://hdl.handle.net/10019.1/58159 en Stellenbosch University 184 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Polymers Membranes (Technology) Dissertations -- Polymer science Du Toit, Thomas The design, synthesis and characterization of neutral polymeric bonding agents |
| title | The design, synthesis and characterization of neutral polymeric bonding agents |
| title_full | The design, synthesis and characterization of neutral polymeric bonding agents |
| title_fullStr | The design, synthesis and characterization of neutral polymeric bonding agents |
| title_full_unstemmed | The design, synthesis and characterization of neutral polymeric bonding agents |
| title_short | The design, synthesis and characterization of neutral polymeric bonding agents |
| title_sort | design synthesis and characterization of neutral polymeric bonding agents |
| topic | Polymers Membranes (Technology) Dissertations -- Polymer science |
| url | http://hdl.handle.net/10019.1/58159 |
| work_keys_str_mv | AT dutoitthomas thedesignsynthesisandcharacterizationofneutralpolymericbondingagents AT dutoitthomas designsynthesisandcharacterizationofneutralpolymericbondingagents |