盐质量浓度对交联聚丙烯酰胺微球性能的影响

采用核孔膜过滤、填充砂管、流变、动态光散射(DLS)及显微镜研究了盐质量浓度对交联聚丙烯酰胺微球的形态、大小及封堵特性的影响。结果表明,不同盐质量浓度下微球对核孔膜均能形成有效封堵;填充砂管实验结果表明,盐质量浓度对聚合物微球的封堵强度影响相对较小,而且对微球在填充砂管中的深入性能基本未造成影响。随剪切速率增加,微球分散体系的黏度有所增大,呈现出轻微的胀流性质,且盐质量浓度对交联聚合物微球流变性的影响不大。随着盐质量浓度增加,显微镜下观察到的微球的立体感更强,微球的粒径变小,但变化幅度较小。

Influence of Salinity on the Property of Cross-Linked Polyacrylamide Microspheres

The influence of salinity on the shape,size and plugging property of cross-linked polyacrylamide microspheres were studied by nuclear-pore film filtration experiment and sand-packed model,rheology and dynamic light scattering.The results show that the microspheres with different salinity all plug effectively.The experiments of sand-packed model showed that the salinity has little effect on the plugging properties,and not affects the plugging depth in the model at all.The viscosity of microspheres dispersed system increased with the increasing of shear rate,which displayed the minimal dilatants liquid property,and the salt concentration had little influence on the rheology of cross-linked microspheres.When the salinity increased,the microspheres had more stereo sense and smaller size,but these are only small changes.