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Interactions between nonhydrolyzed polyacrylamide and aluminosilicates are governed by hydrogen bonding: the isolated hydroxyl group plays the role of the surface active site. The most interesting observation concerns the opposing behavior of the two faces of kaolinite: whereas the basal faces act as nonadsorbing surfaces, the edge faces modulate the adsortive capacity. Variations in polymer adsorption closely follow the modification of the surface electrochemical properties. The structure of the aqueous solution near the clay surface also affects the clay-polymer affinity. Results concerning the variation of the surface coverage and the kinetics of the adsorption process are discussed in terms of the local environment of the active site.
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Nabzar et al. (1986) studied this question.
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