VISCOELASTIC PROPERTIES OF WELAN SYSTEMS - PRACTICAL APPLICATIONS

Andreja Zupanèiè

University of Ljubljana, Faculty of Chemistry and Chemical Technology, Aškerèeva 5, 1001 Ljubljana, Slovenia

Abstract

A detailed rheological characterization of aqueous welan systems was performed in the concentration range from 0.1 to 0.5 %w/w of the polymer. In order to illustrate the practical application of aqueous welan systems, the rheological investigations were extended to alumina dispersions in aqueous welan matrices where the polymer concentrations in the disperse medium were of the same range (0.1-0.5 %w/w). The dependence of the viscoelastic properties of aqueous welan systems and alumina-welan dispersions on polymer concentration was examined and discussed in the light of fractional constitutive equations and in the view of practical applications. The experimental data of aqueous welan systems, as well as the results of modeling were compared with those obtained for alumina-welan dispersions