Pressure-induced reentrant micellization of amphiphilic block copolymers in dilute aqueous solutions.

The pressure-induced structural changes of a block copolymer, poly(2-ethoxyethoxyethyl vinyl ether)-block-poly(2-hydroxyethyl vinyl ether) (pEOEOVE-b-pHOVE) in aqueous solutions, were studied by means of small-angle neutron scattering (SANS) and dynamic light scattering (DLS) from atmospheric pressure up to 400MPa. pEOEOVE-b-pHOVE formed a spherical micellar structure above 40°C due to poor solubility of pEOEOVE. Micellization phase diagram was determined by DLS, and a covex-upward pressure-temperature (P-T) phase diagram was obtained having a peak around (P,T)=(150MPa,48°C). The SANS curves at 50°C were analyzed as a function of P. The micellar core size decreased by pressurizing at low P’s (P⩽150MPa) and then increased by further pressurizing (150MPa

Keywords:

• Volume fraction
• Solubility
• Small-angle neutron scattering
• Dynamic light scattering
• Structural change
• Phase diagram
• Aqueous solution
• Chromatography
• Colloid
• Chemistry
• Vinyl ether
• Analytical chemistry
• Copolymer
• Neutron scattering
• Polymer chemistry
• Computational chemistry

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