Well-defined graft copolymers consisting of butyl acrylate (BA) homopolymer or hydroxyethyl methy acrylate and BA copolymer as backbone and polystyrene (PS) as side chains were synthesized by macromer technique to studied their application as a surface modifier for PS films. The results showed that the surface energies (rsD) of both sides of the PS film surface were changed appreciably by adding these graft copolymers but they gave rise to a constant beyond a scope of about 0.5wt% graft copolymer concentration and the differentcomponents of the graft copolymer used here could be enriched on both sides of PS film respectively

which have been iden-tified by ESCA and were consistent with the calculating results by the Gibbs absor-ption isotherm.