Abstract
We report the use of surface quasi-elastic light scattering (SQELS) to investigate the dynamic surface properties of spread films of cyclic poly(ethylene oxide) at various surface concentrations of polymer. Application of an unbiased phenomenological fitting function to the collected heterodyne correlation functions allows the frequency and damping of the capillary waves to be measured. Increasing the surface concentration of polymer causes complex variations in the capillary wave frequency and damping which can only be explained by the existence of a resonance between the capillary and dilational waves. We further analyze the correlation functions in terms of four surface viscoelastic parameterssurface tension, transverse shear viscosity, dilational modulus, and dilational viscosityvia a direct “spectral fit” to the data. At surface concentrations where the surface is saturated with polymer, at least one relaxation process occurs in the frequency regime studied. For the dilational mode of the interface, ...
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