By capillary viscometry and the structural changes micelles cetyltrimethylammonium bromide (CTAB) at 27, 35, 45, 50 and 60 ° C. Because of the concentration and temperature dependences of the relative viscosity determined by the area of the second CCM, which are observed and structural transitions CTAB. Changes in the relative viscosity thus observed, more pronounced at lower temperatures. Unlike previously published in this work, data were obtained on the second CCM in a wider temperature range.