Experimental and mathematical modeling investigation on the dynamic viscoelasticity behavior of free liquid films prepared by alpha olefin sulfonate

The viscoelasticity behavior and corresponding mathematical models for free liquid films under dynamic conditions were investigated respectively. Systematic analysis of the effects of sinusoidal exciting frequency, surfactant concentration, inorganic salt, temperature and polymer additives on the viscoelasticity modulus of AOS (alpha olefin sulfonate) liquid films were performed in detail. Higher viscoelasticity modulus could be achieved for AOS liquid films at about the critical micelle concentration of AOS solution. Meanwhile, increasing the NaCl concentration increased both the values of the overall modulus (E) and elastic modulus (E′) of AOS liquid films, while the values of viscous modulus (E″) decreased in the presence of NaCl. The values of E, E′ and E″ of AOS liquid films decreased along with the increase of temperature. The viscoelasticity modulus of AOS liquid films improved significantly after the addition of polymer. Additionally, the experimental results indicated that the dynamic extensional viscoelasticity behavior of free liquid films could be simulated by A type standard linear and B type standard linear type model in the experiments.