Abstract: A hydrophobic associated water-soluble polymer with two phenyl groups and long chain alkyl in side chain has been syn- thesized in aqueous solution by radical micellar polymerization.Thickening effect of the copolymers aqueous solution with dif-ferent hydrophobic group length existing in different surfactants has been studied. Results obtained show that the copolymers
behavior excellent property of viscosity increasing when the numbers of carbon atom in hydrophobic group are 8 and dodecy-benzene sulfonic sodium exists. In addition, conditions of the synthesized reaction are optimized through orthogonal design method and the optimal reaction conditions are as follow: the concentration of acrylamide is 10%-15%, the feed of initia-
tor, hydrophobic monomer and surfactant are 0.2%, 0.5%(mol), 0.75% relative to the AM feed, respectively.

Key words: radical micellar polymerization, hydrophobic associated, synthesis