A Comparative Study on Extensional Rheological Behaviors Between Viscoelastic Surfactant and Water-Soluble Polymer Solutions
Viscoelastic surfactants(VES)are a class of surfactants that can form wormlike micelles in solution through self-assembly and exhibit viscoelasticity on a macroscopic level.Due to their strong viscosifying ability and reversible shear properties,viscoelastic surfactants are often called"living polymers"or"equilibrium polymers".However,the similarities and differences in the extensional rheological behavior between VES and polymer solutions were rarely explored yet.In this work,through a homemade dripping onto substrate(DoS)extensional rheometer,the solution extensional rheological behaviors of a viscoelastic surfactant,erucic acid amidopropyl betaine(EDAB),and a commonly used water-soluble polymer,polyacrylamide(PAM),in 0.5 mol/L NaCl was compared.The results show that due to the stronger structural flexibility of PAM than the EDAB wormlike micelles,PAM exhibits higher extensional viscosity and unique strain hardening behavior.Compared to EDAB solution,the extensional rheological behavior of PAM solution is more sensitive to temperature because heating can accelerate the disentanglement process of PAM chains.This work deepens the understanding of the behavior of viscoelastic surfactant solutions under extensional flow fields and can provide guidance for their rational use.
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