ON THE NONLINEAR RHEOLOGY OF A WORMLIKE MICELLAR SYSTEM IN THE PRESENCE OF SODIUM-SALICYLATE SALT

The nonlinear rheology of an aqueous wormlike micellar system made of cetyltrimethylammonium chloride with sodium salicylate is studied in t his work. At high NaCl salt concentration the rheological measurements show a Maxwell behavior for all the solutions. The data of these samp les are analyzed with respect to the Spenley, Cates, and McLeish model . The dimensionless quantities sigma(plateau)/G(0) and gamma c tau(R), which characterize the nonlinear rheology are compared to the predict ions of this model. At a fixed surfactant concentration these quantiti es are found to be insensitive to changes in salt concentration and in temperature, respectively. The experimental value of the ratio sigma( plateau)/G(0) we find is close at hand to the theoretical one. A discr epancy between the theory and the experiments occurs,;however, in comp aring the Weissenberg number defined by the product gamma c tau(R). (C ) 1997 The Society of Rheology.