关键词: 聚合物, 凝胶, 流动特性, 分子结构, 识别方法

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