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Roulstone, B.J., 1988. Permeation through polymer latex films. PhD, Nottingham Trent University.
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Abstract
The permeabilities of polymer latex films prepared from surfactant free latices were studied. The work involved studies on surfactant free emulsion polymerisation, the morphology and permeation through model latex films, and latex films containing common latex additives. Also reported is the potential use of surfactant free latices as controlled release drug coatings.
The surfactant free emulsion polymerisation of butylmethacrylate was investigated, and the Smith and Ewart case III was used to describe the reaction kinetics. The emulsion polymerisation of 2-hydroxy- ethylmethacrylate was studied in the absence of surfactant; weakly stabilised latices were produced with significant gel contents.
The morphology of latex films was shown to be a result of the coalescence of the original latex particles, although the films were found to be essentially non porous.
The permeability of latex films to solutes was found to obey Picks laws. The film permeability was shown to decrease with increased coalescence of the latex particles and a reduction in the permeability with film age was found. Permeation through latex films was postulated to be a combination of diffusion through the bulk polymer and the interparticle boundaries. The permeability of core-shell and copolymer latex films showed a reduction in permeability with film age, and the final value was consistent with the presence of a network of the more permeable polymer.
The inclusion of surfactants into clean latex resulted in an increase in the water vapour permeability. These films did not show any reduction in permeability with film age.
| Item Type: | Thesis | ||||
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| Creators: | Roulstone, B.J. | ||||
| Date: | 1988 | ||||
| ISBN: | 9781369324273 | ||||
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| Divisions: | Schools > School of Science and Technology | ||||
| Record created by: | Linda Sullivan | ||||
| Date Added: | 11 Nov 2020 15:07 | ||||
| Last Modified: | 11 Oct 2023 09:54 | ||||
| URI: | https://irep.ntu.ac.uk/id/eprint/41616 |
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