Abstract
Abstract The adsorption of sodium lauryl sulfate and methylcellulose on monodisperse polystyrene latexes has been studied to determine the effect of emulsifier surface coverage on the adsorption of methylcellulose. A differential refractive index technique has been used to determine the concentration of the adsorbate in the serum phase of the centrifuged latex. With latexes containing added sodium lauryl sulfate to vary the surface coverage of the latex by emulsifier, the amount of methylcellulose that was adsorbed depended on the amount of free surface available. Esentially no methylcellulose was adsorbed on the latex having complete surface coverage by emulsifier. The effective molecular adsorption area for a methylcellulose monomer unit was found to be ∼33 A 2 .
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