ESTIMATED BLEND VISCOSITIES BY A SIMPLE AND WORKABLE MODEL

The Lecyar model, derived by remodelling the McAllister model, is able to describe satisfactorily the viscosity-composition dependence for s everal blend systems exhibiting positive, negative and mixed deviation s. In the present work, the model is applied to polycarbonate/acryloni trile-butadiene-styrene blends and polyacetal (polyoxymethylene)/therm oplastic polyurethane blends, with the latter having an elastomer as o ne of the constituents. The model provides a good fit in both cases.