Steady and dynamic rheological behaviors of sodium carboxymethyl cellulose entangled semi-dilute solution with opposite charged surfactant dodecyl-trimethylammonium bromide.

The steady and dynamic rheological behaviors of sodium carboxymethyl cellulose (NaCMC) entangled semi-dilute solution filled with different concentrations of dodecyl-trimethylammonium bromide (C(12)TAB) were investigated. The results reveal that the zero shear rate viscosity (eta(0)) and dynamic modules (G'and G'') increase with C(12)TAB concentration (C(s)), and there exist three scaling regions divided by two critical C(12)TAB concentrations (C(1), C(2) and C(1)('),C(2)('), respectively, from steady and dynamic tests). The increase of viscosity and modules with C(s) is ascribed to formation of network due to C(12)TAB micelles bridging NaCMC chains. The two critical C(12)TAB concentrations implies that the structure evolution of NaCMC-C(12)TAB complex is exposed to three states with increasing C(s), i.e., no network formation, network extent progressive formation and perfect network formation, respectively. Moreover, C(1)('),C(2)(') are a little lower than C(1), C(2), indicating that the dynamic test is more sensitive to detect the structure change of the complex as compared with steady test. Furthermore, it is found that as NaCMC concentration increases, C(1)(C(1)(')),C(2)(C(2)(')), C(1)(C(1)('))-CAC and C(2)(C(2)('))-CAC increase.