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We quantified the adsorption kinetics of cationic polyacrylamide (CPAM) of three charge densities but constant molecular weight and their effects on the dynamics of a polydisperse calcium carbonate (CC) flocculation at various ionic strengths. The adsorption kinetics of CPAM onto PCC can be explained by the balance of the electrostatic and van der Waals interactions, hydrogen bonding and steric hindrance...
The hetero-flocculation of wood fibres and fines was investigated for different bridging configurations of poly(acrylamide) and montmorillonite. Montmorillonite platelets are effective bridging agents between adsorbed polymer layers. This was attributed to the high surface charge density, which causes a higher attraction of the cationic polymer segments protruding from the cellulosic surfaces. The...
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