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Effect of carbomer microgel pH and concentration on the Herschel–Bulkley parameters

Story Anna, Story Grzegorz, Jaworski Zdzisław

Chemical and Process Engineering

2020

Vol. 41, nr 3

173-–182

The article presents an experimental investigation of the rheological properties of carbomer microgels.All of the tested fluids were made up from commercial polyacrylic acid, Carbopol Ultrez 30. Intotal, eighteen microgels were prepared, differing in concentration; 0.2, 0.4 and 0.6 wt%, with sixlevels of neutralisation for pH from 4.0 to 9.0. Based on the experimental flow curves it was foundthat all tested microgels are yield stress shear-thinning fluids. Therefore, the Herschel–Bulkley modelwas used and its rheological parameters were determined. It was found that both the concentrationand the pH value significantly affected the yield stress. As the Carbopol concentration increased,the yield point also increased. With the increasing value of pH, the yield stress first increased untila certain maximum level and then decreased. The maximum values of yield stress were obtained forpH=6to 7, depending on polymer concentration. It was also found that flow curves of the testedmicrogels could be described using one universal master curve, thus they have common rheologicalbehaviour.