Effect of Sodium Dodecyl Benzene Sulfonate on Water-Soluble Hydrophobically Associating Polymer Solutions

摘要

The work presented in this paper focuses on the effect of sodium dodecycl benzene sulfonate (SDBS) on the rheological behaviour of specific-modified hydrophobically associating polymer (HAP) aqueous solutions. The viscosities of polymer solutions from dilute, unentangled semi-dilute, and entangled semi-dilute regimes were examined as a function of shear rate and SDBS concentration. It was found that SDBS enhanced the shear thickening in the entangled semi-dilute regime. The result was explained in terms of the balance between inter- and intra-chain liaisons and the effect of SDBS on the chain dimensions of the polymer. Fluorescent data showed that SDBS was associated with the hydrophobic groups of the polymer, generating a number of microdomains. These microdomains strengthened the structure viscosity of the polymer solutions. The addition of SDBS to the HAP solution also helped build up a reversible molecular structure and even a temporarily three-dimensional network in aqueous solutions via binding SDBS with hydrophobes of the polymer chains, The network structure resulted in a significant increase in viscosity of the polymer solutions. Consequently, the SDBS/HAP systems could be used as thickeners for the fluids used in EOR processes.