The Properties of Polymer-Containing BeO Dispersions in an Acetone–Chloroform Binary Medium

Abstract

The properties of Newtonian and concentrated (non-Newtonian) BeO dispersions in solutions of acidic poly(vinyl acetate-co-vinyl chloride) in binary mixtures of chloroform (a Lewis acid) and acetone (a Lewis base) of different compositions were studied. In contrast to systems characterized by strong acid–base interactions at the particle–medium interface, the role of the steric stabilization factor was found to be extremely low in the studied dispersions. Polymer-containing BeO dispersions in acetone had the highest kinetic stability due to the specific interactions of this solvent with BeO particles and polymer macromolecules contributing to the redispersion of particles and the formation of protective solvation shells. The obtained data on the effect of the dispersion medium composition on the rheological properties of concentrated BeO dispersions can be used for the selection of optimal regimes for preparation of pastes for high-temperature ceramics.