阳离子聚丙烯酰胺微球的黏度特征

摘要

The polymer microspheres plug water-channeling pores through viscosification, adsorption, and retention after de-layed swelling, in which the profile control has an intimate relationship with system viscosity. On the basis of the inverse mi-croemulsion polymerization a series of cationic microspheres were synthesized. And the influence of crosslinker concentration and cationic degree on the particle interaction was explored by the viscosity of swollen microsphere solution. The results show that the appropriate crosslinker concentration in microspheres plays an important role in the formation of spatial structure and interaction enhanment. The cationic degree of 10% is good to obtain great viscositification. Within microsphere mass concen-tration 0. 1%-1%, the viscosity evolution of different cationic degree microspheres corresponds to the Krieger-Dougherty model modified by Tan, in which the specific volume k and constant m characterize the interaction extent of particles, inclu-ding particle intertangling and osmotic deswelling by counterion. The viscosity index in Herschel-Bulkely equation reflects the microsphere concentration at the maximum electroviscous effect.%聚合物微球通过延迟膨胀后的增黏作用及吸附、滞留堵塞窜流孔道，这一调剖机制与体系黏度密切相关。基于反相微乳液聚合合成一系列阳离子微球，通过测量吸水膨胀后微球的黏度，考察交联剂浓度、阳离子度对微球相互作用的影响规律。结果表明，合适的稳定交联剂浓度是颗粒空间结构形成及增强相互作用的重要条件；阳离子度为10%即有较好的增黏作用；微球质量浓度在0．1%~1%的范围内，不同阳离子度微球的黏度变化符合Tan修改的Krieger-Dough-erty模型，该模型扩大了现有模型的浓度范围，其中比体积参数k及其下降指数m的变化可以衡量颗粒之间缠连作用及反离子造成的渗透失胀的程度。 Herschel-Bulkely方程的黏性指数可以衡量电黏作用最强时的微球浓度。