6533b826fe1ef96bd1284efe
RESEARCH PRODUCT
Dilute and semi dilute solutions of block copolymers in water, near-critical and super-critical CO2: a small angle scattering study of the monomer–aggregate transition
Alessandro TrioloFabio TrioloF. Lo CelsoRoberto TrioloDorina Ines Donatosubject
Statistics and ProbabilityMaterials scienceSmall-angle X-ray scatteringScatteringAstrophysics::High Energy Astrophysical PhenomenaThermodynamicsCondensed Matter PhysicsMicelleSupercritical fluidCondensed Matter::Soft Condensed MatterCore (optical fiber)chemistry.chemical_compoundMonomerNuclear magnetic resonancechemistryCopolymerSmall-angle scatteringdescription
Abstract Small angle neutron (SANS) and X-ray (SAXS) Scattering measurements on aggregate formation of block copolymers in water and in near-critical and supercritical CO2 are reported here. Time Resolved SAXS (TR-SAXS) has also been performed in the supercritical region. Experiments have been carried out for a series of different thermodynamic conditions, changing the solvent density by profiling the pressure at constant temperature. A sharp transition between monomers dissolved as random coils and micelles characterized by a solvo-philic shell and a solvo-phobic core occurs when the solvent density reaches the critical micellization value. This is easily shown in the case of scCO2.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2002-02-01 | Physica A: Statistical Mechanics and its Applications |