Abstract
The adsorption of the nonionic surfactants Triton X-100 and C12E7 on predominantly hydrophobic polystyrene latex particles has been examined as a function of surfactant concentration by measuring the hydrodynamic radius by dynamic light scattering and adsorption isotherms by a surface tension technique. The adsorption behavior of these materials differs significantly and is related to the structures of the surfactant “tails”. Adsorption of TX-100 most probably occurs in an approximately perpendicular geometry with contact between its methyl end groups and the partially extended polymer chains at the latex surface and is accompanied by association between the aromatic nuclei of the adsorbed surfactant molecules. The latter leads to cooperative adsorption and an S-type isotherm. The perpendicular adsorption mode leads to expansion of the polymer chains for steric reasons, giving a pronounced increase in the hydrodynamic radius in the initial adsorption stage. There is a larger adsorbed amount of TX-100 comp...
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