Abstract
The adsorption of n-alkyltrimethylammonium ions on polystyrene surfaces has been examined, using samples of polystyrene prepared by bulk polymerization and by emulsion polymerization. The adsorption on to the surface of latex particles was examined as a function of alkyl chain length, pH and ionic strength. The adsorption process occurred in three main steps. First, a well-defined “knee” was found which corresponded to the adsorption of the surface active cations on to anionic groups on the surface with the alkyl chains lying flat on the surface. Second, a more gradual adsorption occurred with the alkyl chains adsorbing onto a surface with a net positive charge. Third, as the critical micelle concentration of the surface active agent in solution was approached, evidence was obtained of association of the alkyl chains on the particle surface.
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