In order to eliminate the disadvantageous effect of surfactant on relative molecular mass and post-treatment in preparing fluorinated hydrophobically associating polyacrylamide (FPAM) by free radical micellar copolymerization and to increase compatibility of fluorinated monomer and AM

fluorinated surfaceactive monomer (FSM) was synthesized by IPDI

dodecafluoroheptanol (FOH) and allyl polyethylene glycol (APEG) and copolymerized with AM by aqueous solution polymerization

then FPAM was achieved without post-treatment.The micellization of FSM was determined by surface tension.Rheometer

dynamic laser scattering (DLS) and atomic force microscope (AFM) were used to characterize rheological behaviors

size and morphology of the associative structure in FPAM solution

respectively.The results show that the critical micelle concentration (CMC) of FSM is 1.28 g・L-1 at 25℃

and the according surface tension γCMC is 26.77 mN・m-1 which displays that FSM possesses higher surface activity.FPAM solutions are belong to pseudoplastic fluid and have salt resistance to some extent.At the same time

the critical associating concentration of FPAM solution is 0.660%.Indicated by DLS and AFM

there exists an associative structure in FPAM solutions

even the concentration is lower than the critical associating concentration.Therefore

the FPAM molecules have strong hydrophobic association.