剪切下交联研究

研究剪切下交联情况，将交联过程描述为4个连续阶段，最后一阶段得到均匀分散的微凝胶颗粒，低毒交联体系（聚丙烯酰胺共聚物/Al^3 ）的实验结果证明，交联剂浓度，pH值，流变仪狭缝大小和剪切速率等因素对交联时间和凝胶的最终剪切黏度等理化性能都有影响，通过控制合适的剪切条件，可以制备新型分散凝胶体系。

Crosslinking under shear

In water shut off operations, the polymer solution and the crosslinker are currently mixed into surface facilities just before to be injected through the production or injection well and then inside the reservoir. Therefore, the crosslinking system is always subjected to shear stresses while gelling, so, the process of the crosslinking under shear should be studied. This paper reports a theoretical and experimental investigation of the process of the crosslinking under shear. The proposed theory describes the crosslinking under shear as a four successive steps process, and a solution of monodispersed microgels is obtained at the end of the final step. New experimental data, obtained by using a low toxicity crosslinking system, i.e. a weakly hydrolyzed and sulfonated polyacrylamide together with Al 3+ are reported, the authors of this paper also analyzed the effects of Al 3+ concentration, pH, rheometer gap and applied shear rate to the crosslinking system under shear, found that the final shear viscosity, the characteristic time T g are all influenced by the shear rate, therefor new monodispersed microgel can be prepared under the proper condition under shear.