两性瓜尔胶衍生物溶液的流变特征

Rheological Characteristics of Aqueous Solutions of an Amphoteric Guar Gum Derivative

借助旋转粘度计研究了一种两性瓜尔胶衍生物(E-AMPHO-S)溶液的流变特征,考察了衍生物浓度、外加盐和温度对E-AMPHO-S溶液流变性能的影响。发现在实验条件下,E-AMPHO-S溶液呈非牛顿流体特征,具有剪切变稀特性;随改性瓜尔胶浓度增大,E-AMPHO-S溶液具有增强的触变性质;在一定浓度盐溶液中,E-AMPHO-S可表现出明显的反聚电解质溶液粘性行为;E-AMPHO-S溶液的零切粘度可由Spencer-Dillon方程外推得出,其与温度的依赖关系服从Arrhenius公式。

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 (eta(0)) could be obtained by using Spencer-Dillon equation, and the temperature dependence of eta(0) could be expressed by a relation of the form of the Arrhenius equation.