CTAC表面活性剂水溶液的流变特性

Rheological Properties of CTAC Surfactant Aqueous Solutions

在25℃条件下,测量了质量分数w=0.007%～0.15%范围内表面活性剂水溶液的流变特性。实验结果表明,表面活性剂稀溶液在剪切作用下出现剪切增稠转变,随着溶液浓度的增加,剪切增稠转变越来越弱。当浓度达到某一临界饱和浓度时,不再有剪切增稠转变发生,该浓度所对应的流变曲线称为最大黏度线;对于表面活性剂稀溶液,剪切诱导时间和剪切平衡时间均是剪切速率的幂函数,幂指数为-1.0;剪切增稠转变结束后,表面活性剂稀溶液的稳态黏度随浓度增大而增大,当w>0.05%时,稳态黏度逼近最大黏度线,继续增大浓度,稳态黏度几乎保持不变。

Under the condition of 25℃, the rheological properties of the surfactant solutions with concentrations ranging from 0.007% to 0.15% were measured. The shear-thickening transitions were observed for dilute surfactant solutions, and the shear-thickening effect becomes weak with further increasing concentration. When the concentration reaches a certain critical saturation one, there is no shear-thickening transition observed again, and the viscosity curve at the critical saturation concentration is called the maximum viscosity curve. For dilute surfactant solutions, both the shear induction time and shear equilibrium time can be described as power functions of shear rate, and the exponent is -1.0. After the shear-thickening transition, the steady viscosities of dilute surfactant solutions increase with the concentration. When the concentration exceeds 0.05%, the steady viscosity approximates the maximum viscosity curve and does not increase with further increasing concentration.