Concentration factor and rheology of aqueous titanium dioxide dispersions

Abstract

The rheological properties of aqueous titanium dioxide dispersions have been studied by rota tional viscometry. It has been established that the studied disperse systems are highly structured, and their degree of structuring dramatically increases with the volume fraction ϕ of the solid phase. At solid phase con tents ϕ ≥ 0.164, the breakage of the disperse structure is accompanied by the appearance of local discontinu ities and an abnormal dependence of viscosity on shear stress. The results obtained have been analyzed in terms of the Uriev theory of aggregated systems. The radii of aggregates and maximum solid phase content ϕ m that corresponds to the formation of a continuous disperse structure under the conditions of dynamic impact have been calculated.

Thermal Stability of Organic-Inorganic Composites Based on Dimethacrylate-Tetraethoxysilane System

“…Within statistical elasticity theory of molecular grid of spatial crosslinked polymer the dependence of crosslinking density (M c ) on the high elastic modulus E ∞ can be described as [7]:…”