| Autor: |
Y. Chung-li, J. W. goodwin, R. H. Ottewill |
| Rok vydání: |
2007 |
| Předmět: |
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| Zdroj: |
Kolloidchemie heute II ISBN: 9783798517981 |
| DOI: |
10.1007/bfb0117065 |
| Popis: |
A series of polystyrene latices prepared by emulsion polymerisation have been characterised by electrophoresis. Dodecanoic acid, dodecylamine hydrochloride and dodecylphosphoric acid were used as emulsifying agents and hydrogen peroxide and potassium persulphate as initiators. After a preliminary dialysis to remove oxidation products formed in the polymerisation the mobility against pH curves showed regions which were characteristic of the adsorbed surface active agent. After extensive dialysis these regions were no longer present and the curves were characteristic of a carboxylic acid with a surface pK of 4.64. The experiments indicated that the carboxyl groups were an integral part of the polymer. This was confirmed by the preparation, using suspension polymerisation, of a dispersion of polystyrene particles in the complete absence of surface active agent. For this material the mobility — pH behaviour was very similar to that of the extensively dialysed latices. A detailed discussion is given of the problem of obtaining pK values from electrokinetic data. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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