用不同类型粘度计测定交联聚合物溶液流变性质

用奥氏毛细管粘度计、落球粘度计和HAAKE RS150型流变仪分别测定了高相对分子质量、低浓度的部分水解聚丙烯酰胺（HPAM）与柠檬酸铝（AlCit）交联体系在交联反应过程中的粘度值，研究了在不同反应时间下HPAM—Al-Cit交联体系的粘度与剪切速率的关系。结果表明，在低剪切速率时，HPAM—AlCit交联体系的粘度随反应时间增加呈下降趋势；在剪切速率较高时交联体系具有剪切稠化现象；HPAM与AlCit发生分子内交联反应形成交联聚合物线团在水中的分散体系，这是交联体系粘度随反应时间增加而降低和剪切变稠的主要原因。

Measurement of rheological properties of linked polymer solution by different viscometers

The viscosity of solution in the reactive process of low concentration and high molecular weight partially hydrolyzed polyacrylamide(HPAM) and aluminum citrate(AlCit)cross-linking system were determined by Ostwald capillary viscometer,dynamic viscometer and HAAKE RS150 rheometer.The relationship between viscosity of HPAM/AlCit cross-linking system and shear rate was investigated for different reaction time.The experimental results show that the viscosity of HPAM/AlCit cross-linking system decreases with reaction time in lower shear rate and the system represents shear-thickening property after period of reaction time in higher shear rate.The linked polymer solution is formed by intramolecular cross-linking of HPAM and AlCit forming linked polymer coil(LPC) in lower concentration of the system,which is the reason for the viscosity of HPAM/AlCit cross-linking system decreasing with reaction time and shear-thickening.