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We study the structural changes occurring in the isotropic phase of theC$_{12}$=EO$_6$/H$_2$O lyotropic mixture (up to 35% surfactant weightconcentration) upon increasing the concentration and temperature, from smallindividual micelles to an entangled network which subsequently becomesconnected. High-frequency (up to $\omega = 6 \times 10^4$ rad/s) rheologicalmeasurements give us access to the viscoelastic relaxation spectrum, which canbe well described by the sum of two Maxwell models with very differenttemperature behaviors: the slower one ($\tau _1 \simeq 10^{-4}$ s) is probablydue to reptation, and its associated viscosity first increases with temperature(micellar growth) and then decreases after reaching a maximum (appearance ofconnections). The fast mechanism ($\tau _2 \simeq 10^{-6}$ s) remainspractically unchanged in temperature and can be related to the relaxation oflocal micellar order, as observed at higher concentration in a previousinvestigation. This interpretation is confirmed by additional measurements inaqueous mixtures of the related surfactant C$_{12}$EO$_8$ (which forms smallermicelles), where only the fast mechanism -related to local order- is detected.

Structural Transition in the Isotropic Phase of the C$_{12}$EO$_6$/H$_2$O Lyotropic Mixture: A Rheological Investigation