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Influence of Polyvinyl Alcohol/Zirconium Polycation Interactions on the Properties of Aqueous Alumina Suspensions
C. Rödel1, F. Wehner2, A. Meyer1, T. Meissner1, A. Potthoff1, A. Michaelis2
1 Fraunhofer IKTS Dresden, Winterbergstrasse 28, 01277 Dresden, Germany
2 Institute of Material Science, Dresden University of Technology, 01062 Dresden, Germany
received May 08, 2012, received in revised form July 18, 2012, accepted August 3, 2012
Vol. 3, No. 3, Pages 141-150 DOI: 10.4416/JCST2012-00016
Abstract
This paper presents and describes the interactions occurring in polyvinyl-alcohol-containing alumina suspensions containing different multivalent cations. The influence of Mg (+II), Ca (+II), Al (+III) and Zr (+IV) cations was studied systematically by means of surface potential, viscosity, sedimentation and adsorption measurement techniques. The results were compared with the results obtained for a monovalent reference (K (+I)). Whereas for Mg (+II), Ca (+II) and Al (+III) the interactions can be explained by compression of the electric double layer or formation of hydroxides, Zr (+IV) shows a unique affinity for polyvinyl alcohol. This interaction yields a significant improvement in suspension flowability and sedimentation stability. Moreover this specific interaction is independent of the solid surface. Thus the stabilizing effect of polyvinyl alcohol/Zr (+IV) can be combined with the effect of a polyacrylate dispersant.
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Keywords
Processing, suspension, alumina, polyvinyl alcohol, zirconium cations
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