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F. Lafuma

The role of water-soluble polymers at the solid/liquid interface in the mechanisms of flocculation/stabilization

of aqueous colloidal suspensions (in English)

Polimery 1998, No 2, 104

DOI: dx.doi.org/10.14314/polimery.1998.104


The role of polymers in disperse media is discussed in terms of F.L.'s own studies with particular reference to the separation of solid-liquid systems whose colloidal particles fail to settle (clarification of solutions, flocculation of slurries, etc.), enhancement of stabilization (inks, paints, drilling muds, etc.) and control of aggregation processes (thickeners, binders). For unsaturated surfaces, flocculation mechanisms with nonionic polymers (bridging) and the use of polyelectrolytes to neutralize surface charges and also mixed mechanisms are discussed. For saturated surfaces, steric stabilization with polymers at high surface coverage is described. The mode of adsorption governs the effect of adsorbed polymers on the stability of aqueous suspensions. The degree of polymerization, chemical composition and the architecture of polymer chains affect the properties of polymers as flocculating and dispersing agents. Copolymers allow to modify interactions in the polymer—suspended particle system but the chemical history of the copolymer imposes serious limitations. Extraneous factors (pH, ionic strength, temperature, etc.) are also of consequence.

Keywords: effects of adsorbed polymers in aqueous disperse systems, polyelectrolytes, flocculation and stabilization mechanisms, polymers as flocculants and dispersants, copolymers

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