Abstract
Using oscillating barriers method, the dilational surface viscoelasticity of nonionic hydroxypropyl methyl cellulose (HPMC)/C n TAB adsorbed layers are measured at air–water surface. The evaluation of such measurements shows the information about the influence of C n TAB surfactant on the dilational surface viscoelastic properties of HPMC. The dilational viscoelasticity of HPMC/C n TAB adsorbed layers depends on the surfactant chain length, bulk concentration of HPMC or C n TAB, as well as the oscillation frequency. The frequency dependent of dilational viscoelasticity for HPMC/C n TAB surface layer is weaker than that of pure HPMC and C n TAB systems. For HPMC/C 12TAB surface layer, its dilational elasticity and stability are the lowest comparing with HPMC/C 16TAB and HPMC/C 14TAB surface layers. However, the dilational elasticity of HPMC/C 14TAB surface layer shows a remarkably higher value than that of HPMC/C 16TAB. This phenomenon is ascribed to more HPMC molecules adsorb on the surface except some C 14TAB molecules at this C 14TAB concentration.
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