Pluronic triblock copolymers usually present complex phase behavior depending on the number of PEO and PPO blocks contained in the polymer. They have a great dependence to temperature and concentration, both considered as key factors in the pluronic phase behavior. The evaluation of physicochemical properties such as densimetry and sound velocity, as well as the determination of the size distribution profile of particles of P-104/water in solution allow obtaining a detailed temperatureconcentration behavior of the system. In this work we present a study of P104/water behavior through density, ultrasound velocity and dynamic slight scattering (DLS) measurements in a wide range of temperatures. The critical micellar temperature (CMT) and the sphere-to-rod micelle transition temperature (GMT) were determinate as a function of concentration.
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