Abstract
The dynamics of the micelles of two triblock poly(ethylene oxide)−poly(propylene oxide)−poly(ethylene oxide) copolymers, the Pluronics EO13PO30EO13 (L64) and EO73PO27EO73 (PF80), has been investigated using two chemical relaxation methods: the temperature-jump (T-jump) with Joule heating and light scattering detection of the relaxation effects and the ultrasonic relaxation. These two methods are capable of detecting dynamic events with characteristic times between 1 ns and 2 s. The ultrasonic absorption measurements in the frequency range 0.4−85 MHz showed the existence of a large excess absorption with respect to water, occurring at temperatures above the critical micelle temperature (cmT) of the Pluronic solutions investigated. The frequency dependence of the absorption revealed the existence of a relaxation process with a relaxation frequency around 0.5 MHz at 40 °C for L64. This process was assigned to the exchange of copolymer between micelles and intermicellar solution. The T-jump experiments revea...
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