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Rheological and flow birefringence measurements both in the oscillating and in the constant shear rate mode were carried out on mixtures of aqueous solutions of Tetradecylpyridiniumsalicylate and Tetradecyltrimethylammoniumsalicylate. In these mixtures the flow behavior varies from purely viscous to strong elastic. Experimental evidence for the theoretically predicted validity of the linear stress optical law in viscoelastic detergent solutions containing rodlike particles is given. Furthermore it is found, that the stationary and dynamic viscoelastic behavior of the systems under consideration can be described by a single relaxation time according to the Maxwell model. A comparison with data from micellar kinetics shows, that the macroscopic flow behavior of these solutions is determined and controlled by the chemical relaxation time of the micellar structures. This chemical relaxation time varies about two orders of magnitude in the mixtures while the shear modulus G0, which is determined by the number density of the rod‐like micelles, remains approximately constant.

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