Abstract
A three-parameter model is introduced to describe the shear rate — shear stress relation for dilute aqueous solutions of polyacrylamide (Separan AP-30) or polyethylenoxide (Polyox WSR-301) in the concentration range 50 wppm − 10,000 wppm. Solutions of both polymers show for\(1000 s^{ - 1}< \dot \gamma< 50,000 s^{ - 1} \) a similar rheological behaviour. This behaviour can be described by an equation having three parameters i.e. “zero-shear viscosity”η0, “infinite-shear viscosity”η∞, and “yield stress”τ0, each depending on the polymer concentration. A good agreement is found between the values calculated with this three-parameter model and the experimental results obtained with a cone-and-plate rheogoniometer and those determined with a capillary-tube rheometer.
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