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The aggregation process of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) copolymer, (EO) 78 (PO) 30 (EO) 78  (Pluronic F68) in methanol and acetonitrile was characterized by using viscosity and dynamic light scattering measurements. For low concentrations (4 &lt; C &lt; 10 mg/mL), we assumed that we had a swelling of unimers when they came into contact with an organic solvent. Increasing this concentration to 10 &lt; C &lt; 20 mg/mL favored the association of the unimers into micelles. ForC40 mg/mL, the hydrodynamic radii increased, suggested to be due to an aggregation process of the micelles with themselves. For 40 mg/mL, we assume that the association of compact micelles is completed. For higher concentrations (C50 mg/mL), the increases in  RH  for F68/methanol and for F68/acetonitrile were attributed to the large micelle formation.

Effect of Organic Solvent on (EO) 78 (PO) 30 (EO) 78 F68 Tri-Block Copolymer: Viscosity and Dynamic Light Scattering Measurements