Catalytic activity of cationic latices prepared according to the shot-growth method
✍ Scribed by Fred Twigt; Jurgen Broekman; Pieter Piet; Anton L. German
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 434 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0014-3057
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✦ Synopsis
Stable cationic latices were prepared by the shot-growth method and by use of the ionic copolymer poly(styrene-co-1-methyl 4-vinylpyridinium bromide) (PS~IPVP) as emulsifier. An increase in co-catalytic activity of the shot-growth latices in the cobalt(II)phthalocyanine-tetrasodiumsulphonatecatalysed oxidative coupling of 2-mercaptoethanol was found compared with the batch latex system. Although PS-qPVP was successfully applied as emulsifier only a moderate increase in oxidation rate was found compared with the surfactant-free system. The surface characteristics of both latex systems were investigated by ~-potential measurement and conductometric titrations. These measurements suggest the presence of a water soluble hairy polymer shell.