The selective aggregation of the polyether silicone oil (PSO) on the surface of polystyrene (PS) films was investigated by using the contact angle measurement and the attenuated total reflectance Fourier transform infrared spectroscopy.By utilizing the “surface target" effect of the chain segments of the silicon oil

the applied efficiency of the macromolecular surface modifier(PSO) was enhanced greatly.Because the chain segments of silicone oil could preferential aggregate on the surface of the PSO/PS blends

it led the polyether chain segments migrated on the surface of the films which took the climacteric role in improving the hydrophilicity of the films.It was also found that the preferential surface migration of PSO was heavily depended on the surface properties of the contact medium.Compared with the different mechanisms of the surface migration

the inducement of polar groups on substrates (glass or polyimide) made more chain segments of polyether aggregated on the blends surface

and the polar portion of the surface energy of the films was increased greatly.Whatever the samples were annealed by polyimide or polytetrafluoroethylene

the concentration of silicon chain segments in the surface was much higher than that in bulk.It certified that the “surface target” effect of the silicon oil chain segments was much intensive in the blends.In the process of surface migration

the abundant surface structure was reconstructed.Because the inducement of the polar substrates was attenuated quickly as the operating distance increased

the surface concentration gradient of PSO declined acutely when the samples were annealed on glass or polyimide.But the surface concentration gradient of PSO altered gently when the samples were annealed on polytetrafluoroethylene.