Abstract: Poly(methyl methacrylate)-graft-[ω-stearyl-poly(ethylene oxide)] (PMMA-g-SPEO) and poly(methyl methacrylate)-graft-[ω-ethyl-poly(ethylene oxide)](PMMA-g-EPEO) were synthesized by free radical copolymerization of methyl methacrylate monomer with α-methacryloyl-ω-stearyl poly(ethylene oxide) macromonomer or α-methacryloyl-ω-ethyl poly(ethylene oxide) macromonomer. X-ray photoelectron spectroscopy(XPS) analysis indicates the substantial surface enrichment of the stearyl poly(ethylene oxide)(SPEO). In an aqueous environment, the surface rearrangement is limited, as proved by dynamic contact angle tests. The comb-like copolymer presents a special hydrophobic surface with a high SPEO surface density, which may be due to the "tail like" SPEO architecture on the copolymer/water interface.

Key words: Blood compatiable, Amphiphlic copolymer, Macromonomer technique, Surface properties