Abstract
Surface tension of eight different polyacrylamide samples was measured using du Nouy ring, Wilhelmy plate, and maximum bubble pressure methods over a wide concentration range. Experimental results were found to agree with available literature data for diluted solutions of similar polymers. The aqueous polyacrylamide solutions were found to be surface active. The surface tension of the polymer solutions showed a similar behavior to solutions of surfactant. It was noted that the surface tension of polymer solutions decreased linearly with increasing logarithm of concentration; at high concentrations, surface tension remained constant or nearly constant. A possible "CMC-type" behaviour was observed for these polymer solutions and the suggested "CMC" values were calculated based on surface tension and electroconductivity measurements. The experimental results showed that the carboxylic or cationic substituted polyacryamides are more surface active than the unsubstituted polyacrylamides.
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