疏水缔合聚合物流变学测量方法Ⅱ:零剪切黏度

摘要

A suitable rheological model, the Carreau-Yasuda Model, which could well fitting zero-shear viscosity of hydrophobi-cally associating water-soluble polymer (HAWSP ) solution was determined by comparisons among three models and the factors that effect the measure of zero-shear viscosity testing has been discussed, which includes pre-shearing program and load method of force.The minimum shear stress of sweep range was one order lower than yield stress and the load time of stress was about 1200 seconds under the condition of lab experience with pre-sheared of 3 to 5 minutes and shear rate from 20 to 500 s-1 and the following hold up time in the range of 5 to 80 minutes. After the treatment the average errors of zero-shear viscosity replicate determination of HAWSP solutions with different viscosity at Physica MCR301 rheometer are smaller than 3% by setting reasonable rheometry program.%通过对3种能够拟合计算零剪切黏度的流变参数模型的对比,优选了适合疏水缔合聚合物溶液零剪切黏度拟合的流变参数模型(Carreau-Yasuda).对预剪切程序、应力加载方式对零剪切黏度测定的影响规律进行了研究,通过实验确定预剪切程序为:20～500 s-1剪切3～5 min后,静置时间介于5～80 min之间;剪切应力扫描的起始值比屈服应力低一个数量级,应力加载时间为1200 s.在上述实验条件下,在MCR301流变仪上对不同浓度的HAWSP溶液零剪切黏度平行测试结果的平均误差小于3％.