Abstract: By using "macromer technique", the well-defined graft copolymers with polystyrene (PS) as side chains and polybutyl acrylate (PBA) as backbones were prepared and the microphase separation as well as the surface property of these graft copolymers were studied. The experimental results showed that the partial microphase separation could not be observed until the number average molecular weight of the PSside chain was more than₅₉₀₀ and the critical surface tension γ_c was not affected obviously by the composition and the microphase separation of those graft copolymers, but affected by the polar liquid series used (ethanol/water and ethylene glycol/n-octanol). However, the values of γ_S^D (dispersion energy of those copolymer surfaces) calculated by the Good-Giraflco-Fowkes-Young equation were almost constant for all polymers studied here. The results also showed that both sides of the graft copolymer film surfaces were enriched with PBAbackbone.

Key words: Macromer, Graft copolymer, Microphase separation, Surface property, Polystyrene