Abstract
The synergism between wormlike micelles formed from sodium oleate (NaOA) and hydrophobically modified polyacrylic acid (HMPA) was investigated according to their macroscopic performances and mesoscopic scales, using a combination of viscosity/rheology measurements and dissipative particle dynamics (DPD) molecular simulations. The rheology of NaOA wormlike micelles changed significantly following the addition of a small amount of HMPA, which verified the synergistic effect between them. A peak in the apparent viscosity was observed following an increase in the concentration of HMPA, suggesting that the synergistic effect was restricted by the composition of the mixture. A DPD simulation also confirmed that the solution composition had an influence on the root mean square (RMS) end-to-end distances of HMPA, with the observed value fluctuating according to NaOA and HMPA concentrations. The micellar morphology affected the RMS end-to-end distances of HMPA and the presence of NaOA micelles exerted a significant impact on the extension of HMPA at high HMPA concentrations. A proposed synergistic mechanism has been presented according to the experimental and simulation results.
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