The micellar solutions of sodium dodecylsulfate (SDS) and sodium 2-acrylamidododecane sulfonate (NaAMC12S)

which is a surface-active monomer

were prepared

and the solubilization properties of N-dodecylacrylamide (C12AM)

which is a strong hydrophobic monomer

in the two micellar solutions were determined.Based on this determination

the micellar copolymerization of acrylamide (AM) and C12AM was performed in the two micellar solutions

and bipolymer C12AM/AM and terpolymer C12AM/NaAMC12S/AM were obtained

respectively.Their infrared spectra were measured

and the structures were characterized.Their hydrophobic association properties and rheological behavior were mainly studied by using fluorescence probe technique and viscosimetry.The experimental results show that in the micellar solution of surface-active monomer NaAMC12S

the copolymerization of AM and hydrophobic monomer can be realized favorably.Because the surfaceactive monomer also participates in the copolymerization

the product is a terpolymer

C12AM/NaAMC12S/AM.As compared with the biopolymer C12AM/AM

the terpolymer has stronger hydrophobic association properties owing to the incorporation of the surfaceactive monomer NaAMC12S.But then the contribution of the strong hydrophobic monomer

C12AM

to the hydrophobic association of the terpolymer is the main one

whereas the surface-active monomer

NaAMC12S

only plays an assistant role.To prepare hydrophobically association polyacrylamide (HAPAM) in the micellar solution of surface-active monomer not only simplifies the process of micellar copolymerization owing to avoid the procedure of removing surfactants

but also enhances the hydrophobic association properties of HAPAM.Therefore

the method put forward in this work is a significant improvement for the conventional micellar copolymerization.