Abstract
AbstractThe intrinsic viscosity of a polymer is traditionally measured with a capillary tube viscometer where the shear rate range is moderately high. Such method is valid when the polymers are non‐ionic and have low to moderate molecular weight. The viscosity‐shear rate curves obtained for dilute aqueous solutions of two high molecular weight polyacrylamides using two rotational viscometers indicate a strong shear‐dependent viscosity in the medium to high shear rate regions. The zero shear intrinsic viscosity of the polymers determined by extrapolation from the high shear rate region to the zero shear condition may result in large errors. Its implication in predicting the molecular weight of polymers using the Mark‐Houwink‐Sakurada equation is discussed. A rheological equation for intrinsic viscosity as a function of shear rate is proposed.
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