Abstract
The adsorption densities of nonionic and anionic high molecular weight polyacrylamides and xanthan on sand and kaolinite have been determined as a function of mixture salinity at different temperatures. For all systems studied, in a mixture of fixed salinity, there is a decrease of adsorption densities with an increase of temperature. Adsorption density of nonionic polyacrylamides is high at 30°C and then decreases strongly up to 50°C. For polyelectrolytes, the adsorption density remains high from 30°C to 50°C and then starts to decrease up to 90°C. Adsorption of these polymers results from the balance between electrostatic and nonelectrostatic interactions, which can be affected to different extents by an increase of temperature. The results obtained suggest that the temperature dependence of adsorption density can give some insight into the driving forces that govern the adsorption process and, indirectly, into the roles played by electrostatic and nonelectrostatic interactions.
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