A surface active macromonomer of nonylphenol polyoxyethylene ether maleate (OPMA) was prepared with nonylphenol polyoxyethylene ether (OP-10) and maleic anhydride at 95～100℃.Copolymer surfactants of acrylamide (AM) and OPMA were synthesized in aqueous solutions with potassium persulfate (K2S2O8) and sodium bisulfite (NaHSO3) as initiators.The effects of the amount of initiator

OPMA mole fraction in total monomer

total monomer concentration and reaction temperature on intrinsic viscosity and the degree of anion (DA) of copolymers were investigated.The structure and composition of the copolymers were characterized by FTIR spectroscopy

UV spectroscopy

fluorescence emission spectroscopy and conductometric titration.Surface tension and interface tension between kerosene and copolymer aqueous solutions were measured by an optical contact angle measuring device.The experiment results indicated that the polymer of PAM incorporated by OPMA segments exhibited good thickening ability and surface activity due to the strong surface active nonylphenol polyoxyethylene ether groups.The results also showed that the intrinsic viscosity of copolymers reached a maximum value of 764.31 mL/g and DA of copolymer 5.6% when the reaction took 6 h under 35℃

0.06 wt% initiator concentration

0.02 OPMA mole fraction in total monomer and 16 wt% total monomer concentration.The surface tension and interface tension between kerosene and 1.5 g/L copolymer aqueous solution were 53.94 mN/m and 5.41 mN/m

respectively when DA of copolymers was between 2% and 4%.In a word

the intrinsic viscosity and DA of copolymers were strongly influenced by the reaction conditions and the surface activity of copolymers first decreased and then increased with increasing its DA.These copolymers with good thickening ability and surface activity could be used in enhanced oil recovery.