Adding the opposite-charge silica nanoparticles to hydrophobic modified polyacrylamide (hmPAM) solutions presents a significant synergistic effect. The structure and rheology of the hydrophobic modified polyacrylamide nanoparticle mixtures were systematic studied. From the TEM measurement, we can see many hmPAM-nanoparticle cross-links are formed after the addition of opposite-charge silica nanoparticles to the hmPAM solution. The rheology measurement showed that in the semidilute solution of the hmPAM, with the concentration of nanoparticles increases from Φp= 0 to Φp = 6.0×10-4, the zero shear rate viscosity, longest relaxation time, and storage modulus of the hmPAM solution are all increase exponentially. As a comparison, adding the same silica nanoparticles into the unmodified PAM has no cross-links formed and therefore no enhancement of viscosity and viscoelastic. In this presentation, the mechanism of the above phenomenon was also discussed.

Nanoparticles as crosslinking agents for hydrophobic modified polyacrylamide aqueous solution

254th National Meeting (2017)

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