Abstract
The effect of carbon chain length of monohydroxy alcohols on the rheological properties of micellar solutions formed in water/sucrose monohexadecanoate (C 16SE)/monohydroxy alcohol systems (C 3–C 9) was studied. By adding alcohols in the aqueous C 16SE solution, the zero-shear viscosity increases, and then decreases after a maximum for all the systems except for the 1-propanol system. The maximum η 0 increases with the chain length of the alcohol. The oscillatory-shear behavior of the viscous samples can be described by the Maxwell model which is typically observed for wormlike micellar solutions. The plateau modulus ( G 0) related to the number of entanglements between wormlike micelles increases monotonously and G 0 is higher for longer-chain alcohol systems except for the nonanol system, indicating more dense network is formed. The relaxation time ( τ R ) related to the micellar length increases and then decreases with weight fraction of alcohol. It indicates a faster stress relaxation model other than Maxwell model at high alcohol content due to the formation of branched micelles. Longer carbon chain length of alcohol gives higher maximum τ R . The weight fraction of alcohol at which the maximum τ R appears almost corresponds to that for η 0.
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