Abstract
The dynamics of poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethyleneoxide) (PEO–PPO–PEO) in aqueous solutions in the range of the polymer concentrationϕ = 10.0–45.0 wt% has been investigated by the tube inversion method and the internal friction technique.At ϕ≤31.0 wt%, two internal friction peaks are observed with the characteristics of the first-order phasetransition, corresponding to the opaque liquid-to-liquid transition and the phase separation.The opaque liquid-to-liquid transition is due to the sphere-to-rod transition in shape of themicelles, and the phase separation is caused by the destruction of core–shell structure. Atϕ≥32.0 wt%, besides the internal friction peak associated with phase separation, two other peaksare observed, which correspond to the solution-to-gel (liquid-to-crystal) transition andgel-to-solution (crystal-to-liquid) transition, respectively. The former is due to the micellecrystallization, whereas the latter is the result of spherical micelles fusing into wormlike orrodlike micelles at elevated temperatures.
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