Abstract
The dilational viscoelastic properties of partly hydrolyzed polyacrylamide (HPAM) and surfactant (C12COONa-p-C9SO3Na) in the absence or presence of electrolyte were investigated at the decane–water interface by means of longitudinal method and the interfacial tension relaxation method. The polymer plays different roles in influencing the structure of HPAM–surfactant mix-adsorbed layer at different surfactant concentration. At low surfactant concentration, the addition of polymer could sharply decrease the dilational elasticity mainly due to the weakening of the “entanglement” among long alkyl chains in surfactant molecules, while the addition of the polymer may enhance the dilational elasticity due to the slow diffusivity of the polymer chains at higher surfactant concentration. And the added electrolyte, which results in screening of electrostatic interactions between the ionized groups, generally decreases the interfacial dilational elasticity and increases the dilational viscosity. The data obtained on the relaxation processes via interfacial tension relaxation measurement can explain the results from dilational viscoelasticity measurements very well.
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Zhang, L., Wang, XC., Yan, F. et al. Interfacial dilational properties of partly hydrolyzed polyacrylamide and gemini surfactant at the decane–water interface. Colloid Polym Sci 286, 1291–1297 (2008). https://doi.org/10.1007/s00396-008-1894-y
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DOI: https://doi.org/10.1007/s00396-008-1894-y