The key parameters which control the wetting and dewetting properties of polymer thin films on substrates are Hamarker constant(A) and spreading coefficient(S). If the polymer films are formed on non-wettable substrates

they should exist in a metastable state.In this case

when the films are annealed at temperature above their glass transition temperature

dewetting will take place.The dewetting velocity is mainly determined by the surface tension

vicosity of polymer melt and the equilibrium contact angle of polymer droplet on the substrate.For the systems of polymer films on non-wettable substrates

the dewetting dynamics of polymer films will be obviously changed and the films can become stable under special conditions like adding end functional polymer to the system.In this paper

the wetting and dewetting properties of polymer thin films on substrates are reviewed.