Interactions between Polyanion-Polycation Systems and Kaolin

The phase behavior of the polyanion-polycation system, consisting of a branched polyethylene imine and a sodium salt of polyacrylic acid, was investigated as a function of the polymer concentration. At low polymer concentrations a small area of initial phase separation was observed, surrounded by a...

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Bibliographic Details
Published inJournal of colloid and interface science Vol. 168; no. 2; pp. 505 - 513
Main Authors Kötz, Joachim, Kosmella, Sabine
Format Journal Article
LanguageEnglish
Published San Diego, CA Elsevier Inc 01.12.1994
Elsevier
Subjects
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Special properties (catalyst, reagent or carrier)
Liquid solid interface
Electrolyte
Phase separation
Concentration effect
Acrylic polymer
Dispersion
Kaolin
Polyethylene imine
Interaction parameter
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Summary:The phase behavior of the polyanion-polycation system, consisting of a branched polyethylene imine and a sodium salt of polyacrylic acid, was investigated as a function of the polymer concentration. At low polymer concentrations a small area of initial phase separation was observed, surrounded by a homogeneous one-phase system. The homogeneous, concentrated polyanion-polycation systems were characterized viscometrically, densitometrically, and spectroscopically. Under special mixing conditions, a significant viscosity enhancement was observed due to Coulombic interactions between the oppositely charged polyelectrolyte components. The interactions of the polyelectrolyte components with kaolin were investigated separately in the concentration range of initial phase separation as well as in the area of concentrated, optically clear polyanion-polycation systems. In the concentration range of phase separation polyanion-polycation interactions are dominant with regard to polyelectrolyte-kaolin interactions. When adding concentrated homogeneous polyanion-polycation systems to concentrated kaolin dispersions above a critical polyelectrolyte concentration, a transition to polyelectrolyte-kaolin pastes was observed. In general, these results are of practical importance for a better understanding of structuring phenomena in pigment systems.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.1994.1448