Study on the Synthesis and Salt Sensitivity Mechanism of Zwitterionic Polymers
This article utilizes the special performance of zwitterionic monomers in high salt environments,namely the anti electrolyte effect,to design and synthesize a zwitterionic polymer.The polymer is synthesized from zwitterionic functional monomers and acrylamide(AM),with the preferred functional monomer being methylacrylamide propyl-N,N-dimethylbutylsulfonate(NS-2)synthesized from 1,4-butylsulfonic acid lactone and N-(3-dimethylpropyl)methylacrylamide.The optimized conditions for polymer synthesis are:reaction temperature of 40℃,solution pH=7,initiator mass fraction of 0.05％,monomer accounting for 40％ of the total solution mass,reaction time of 10 hours,AM:NS-2 mass ratio of 9:1.Furthermore,a rheometer was used to investigate the effect of salt concentration on the viscoelasticity of polymer solutions,and dynamic light scattering was used to investigate the molecular morphology and distribution patterns under different salt concentrations and salt ion types.The results showed that as the salt concentration increased,the viscoelastic modulus and composite modulus of the synthesized polymer increased,and the molecular chains exhibited a more relaxed morphology and distribution in high salt environments.The fluid dynamics radius increased,and the hydrophobic binding between chains/within chains was enhanced.Large size binding peaks were observed in the entanglement between molecular chains,and the degree of salt ion specific influence was manifested as Mg2+>Ca2+>Na+.
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