Abstract: According to the actual requirement of field production,the molecular construction,flow behaviors and identification method for Al³⁺ cross-linked polyacrylamide gel were investigated by using theoretical analysis and instrument examination method.The results showed that the linking reaction appeared and net construction between gel molecules was formed when fresh water was taken as solvent.The apparent viscosity of gel increased greatly after gel forming.When sewage water was used to prepare gel polymer,the partial net construction in the different chains of gel molecules appeared,and the viscosity of gel almost kept constant after gel forming.The apparent viscosity of gel was equivalent with that of polymer solution made of sewage water under the same concentration of solution.Both the resistance factor (F_R) and residual resistance factor (F_RR) of gel was much bigger than those of polymer solution,and the F_RR was bigger than the F_R for the gel.The measured transition pressure and viscosity can be taken as the index for quickly and effectively identifying gel molecular construction.

Key words: polymer, gel, flow behavior, molecular construction, identification method

摘要： 针对矿场生产的实际需求,利用理论分析和仪器检测方法,对Al³⁺交联聚合物分子结构、流动性质和识别方法进行了研究.结果表明,当用清水配制Al³⁺交联聚合物时,交联反应发生在不同聚合物分子之间,形成"分子间交联"分子结构,凝胶的表观粘度较大.当用污水配制Al³⁺交联聚合物时,交联反应发生在聚合物分子内部的不同支链之间,形成"分子内交联"分子结构,凝胶表观粘度与相同浓度的污水聚合物溶液相当,但前者的阻力系数和残余阻力系数要比后者大得多,且其残余阻力系数大于阻力系数.将转变压力和粘度测试数据相结合,就可以实现对Al³⁺交联聚合物凝胶分子结构的快速、有效识别.

关键词: 聚合物, 凝胶, 流动特性, 分子结构, 识别方法