A new kind macroinitiator PS ACPC has been synthesized via two steps reaction

i. e. anionic polymerization of styrene

followed by end capping the resulting living polystyrene with 4

4' azobis(4 cyanopentanoyl chloride). The prepolymer PS ACPC containing azo group with molecular weight 3000 to 19000 can be used as a macroinitiator for block copolymerization. When it was mixed with methacrylic acid (MAA) or β hydroxypropyl methacrylate(HPMA) in benzene or tetrahydrofuran solvent at 75℃. The decomposition of azo group on PS-ACPC took palce and the PS radical would initiate the second monomer block copolymerization.The resulting block copolymers were characterized by solubility property

GPC

IR

NMR and DCA analysis.It was found that the molecular weights of bdockcopolymers

i.e.PS-b-PMAA

PS-b-PHPMA

are higher than that of prepolymer

respectively

and the descending order of contact angle is PS>PS-b-PHPMA>PS-b-PMAA.