Mechanical properties and dispersion behavior of composite materials compounded with surface treated titanium dioxides

The mechanical properties of polycarbonate compounded with titanium dioxide are investigated. Titanium dioxide treated with methyl polysiloxane on alumina silica coating is compounded into the polymer by using a twin screw extruder. Izod impact strength of this composite material is higher than that of the composite material compounded with untreated titanium dioxide. The dispersibility of this treated filler is evaluated by fracture surface and turbidity of the solution of the composite materials. The results suggest that the composite material compounded with titanium dioxide treated with methyl polysiloxane and alumina silica has higher dispersibility. Also, the melt viscosity of the composite material shows the same behavior as that of neat polycarbonate. This result suggests that the melt viscosity is affected by the dispersibility of the particles.