Investigation of a polyelectrolyte degradation with viscometry

Abstract

Ultrasonic degradation of a cationic polyelectrolyte, polydiallyl dimethylammonium chloride in aqueous solutions was investigated at 25°C for the first time according to the literature. Degradations were performed at a varying molar concentration of NaCl (0.05-0.50-1.00 M), using different sodium salts with constant molar concentrations (Na2SO4, NaNO3, NaBr) in the solution and at medium pH values of 1, 3 and 5. The ultrasound frequency (20 kHz), intensity and polymer concentration were kept constant (0.005 g/mL). By doing so, only the effect of the solvent quality was studied. The degradation process was characterized with viscometry and the Ovenall/Harrington/Madras model was successfully applied to predict the degradation parameters. The results show that the degradation efficiency depends strongly on the solvent quality.

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