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The influence of shear forces on clay modification with oppositely charged polyelectrolytes
Author(s) -
Petzold Gudrun,
Berwald Siegfried,
Buchhammer HeideMarie
Publication year - 2000
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/1439-2054(20000601)279:1<10::aid-mame10>3.0.co;2-6
Subject(s) - polyelectrolyte , materials science , adsorption , chemical engineering , surface charge , dispersion (optics) , flocculation , particle (ecology) , polymer , titration , precipitation , cationic polymerization , polymer chemistry , composite material , inorganic chemistry , chemistry , organic chemistry , geology , meteorology , physics , oceanography , optics , engineering
The interaction between the oppositely charged polymers poly(dimethyldiallylammonium chloride) (PDADMAC) and poly(maleic acid‐ co ‐styrene) in the presence of clay can be used for strong surface modification. Different methods were applied for characterizing each step of the reaction and the properties of the modified material. By characterizing the formation of the pure polyelectrolyte complex in solution as well as the three component system (two polyelectrolytes in presence of clay) with polyelectrolyte titration and comparing these results with the total carbon content, it was shown that a significant quantity of a soluble, positively charged polyelectrolyte complex is formed in the system. The strong cationic surface charge is obtained by precipitation of this complex on clay. It was found that the conditions of reaction (type of stirrer, time) strongly influence the particle properties like particle size and adsorption behavior/surface charge. The higher surface charge and the greater diameter of particles was obtained with an anchor stirrer, whereas the formation of larger particles and the precipitation of the complex is prevented by the stronger shear forces of the leaf stirrer.