Acrylamide(AM),2-acrylamido-2-methylpropanesulfonic acid(AMPS)and dimethyl-diallyl ammonium chloride(DMDAAC)as monomers to prepare amphoteric polyacrylamide,the salt resistance was tested.The result showed that qualitative analysis by infrared spectroscopy and nuclear magnetic reso-nance confirmed that the synthesized product was the target product,and AMPAM can maintain a viscosity of more than 10 mPa·s in 20 000 mg/L NaCl solution and 10 000 mg/L CaCl2 solution.Scanning elec-tron microscopy was used to observe the changes in the microscopic morphology of AMPAM solution with 0.5％concentration at different salinity.Due to the serious weakening of intermolecular attraction and repulsion,the molecular chains began to converge and curl,forming a large number of molecular clusters and eventually forming a complete block structure.At this time,the viscosity of the solution changed little and gradually became stable.
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