Paper chemistry: Interactions of thermo mechanical pulp fractions with high molar mass cationic polyacrylamides: Part 1. Adsorption

The adsorption of three high molar mass cationic polyacrylamides on thermo mechanical pulp was studied. Three polyelectrolytes of different charge densities and three different pulp fractions were used. The adsorption experiments were conducted at long contact times under low shear conditions representing the equilibrium state, as well as at short contact times under high shear turbulence mixing representing industrial papermaking conditions. The time-dependence of the adsorption was studied by altering the sampling time in a standard Dynamic Drainage Analyzer. The amount of adsorption was analyzed by a polyelectrolyte titration method. The aim of this study was to find more fundamental information of the influence of pulp fractionation on adsorption phenomena. The results showed that, at long contact times under low shear conditions, the charge density of polyelectrolyte did not affect its adsorption amount at low dosages, but that the adsorbed amount was defined by the type of the pulp fraction. At higher polyelectrolyte dosages the adsorption was influenced by both the charge density of polyelectrolyte and the type of the pulp fraction. Generally, the different combinations of pulp fractions and polyelectrolytes had unique adsorption kinetics, which is an interesting finding in regard to their practical applicability.

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