Molecular dynamics simulation study on behavior of modified polyacrylamide reducing oil-water interfacial tension
Molecular dynamics simulation method was used to investigate the interfacial activity of partially hydrolyzed poly-acrylamide(HPAM)and modified HPAM at the atomic and molecular level.The results show that the ability of HPAM to reduce the oil-water interfacial tension is extremely limited,while the HPAM with hydrophobic groups has a better effect on reducing the interfacial tension.The hydrophobic groups in the modified HPAM enhance the interaction with the oil phase,and form a dense polymer film at the interface,which can increase the thickness of the oil-water interface layer,isolate the oil-water phase contact,thereby reducing the interfacial tension formed by the oil-water contact.The presence of salt ions increases the oil-water interfacial tension.The sulfonic acid group introduced by modified HPAM has better salt resistance,which can reduce the aggregation of salt ions at the interface,thereby weakening the effect of salt ions on the interfacial tension.
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