Abstract
The salt curve is well documented in the literature, whereby the viscosity of a solution initially increases with the addition of salt but then decreases with further increases in salinity. This paper examines the rheological behavior of eight common shampoo bases made with sodium lauryl ether sulfate or a mixture of ammonium lauryl ether sulfate and ammonium lauryl sulfate. Dynamic rheological measurements reveal that in all eight cases the salt effect is due to a variation in micellar relaxation time. The profile of the relaxation time vs. salt concentration was found to mirror the variation with salinity in measured entanglements per micelle. The roles of increased micellar branching, decreased micelle length, and increased micellar flexibility at higher salinity are outlined here.
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