Abstract: The rheological characteristics of aqueous solutions of an amphoteric guar gum derivative, namely E-AMPHO-S, were studied in terms of the effects of its concentration, added salts and temperature by means of a rotating rheometer. It was found that E-AMPHO-S solutions investigated behaved as non-Newtonian shear-thinning fluids. With the increase of E-AMPHO-S concentration from 0.1％ to 2.0％(g•mL－1), the consistency coefficient increased while the viscosity behavior index decreased. The thixotropic response became stronger when E-AMPHO-S concentration was increased from 1.0％ to 3.0％(g•mL－1). The obvious viscosity behavior of “anti-polyelectrolye solution” was observed in aqueous salt solutions containing calcium chloride. The zero shear viscosity (η0) could be obtained by using Spencer-Dillon equation, and the temperature dependence of η0 could be expressed by a relation of the form of the Arrhenius equation.

Key words: Guar gum derivative, Rheological property, Pseudoplastic fluid, 　Thixotropy, Anti-polyelectrolyte solution behavior, Zero shear viscosity