Dispersion forces effects in the instability of polymer films

We have investigated the dispersion forces effects in the instability of polystyrene films within the framework of the frequency-dependent theory. The calculated results of excess free energy, wavelength and growth rate show that the stability of the film can be tuned by the properties and the variation of the thickness of the coating. As the film thickness increases, the retardation effects can be significant and the full results of free energy must be used to deal with the instability of the polystyrene films.