6533b7d1fe1ef96bd125c172
RESEARCH PRODUCT
Modelling small angle neutron scattering data from polymers in supercritical fluids
R. TrioloF. Lo CelsoDorina Ines DonatoJ. S. JohnsonJ. S. JohnsonJ. S. JohnsonFabio TrioloFabio TrioloAlessandro TrioloAlessandro Triolosubject
chemistry.chemical_classificationCrystallographyMaterials sciencechemistryChemical physicsCopolymerSolvationPolymerFluorocarbonSmall-angle neutron scatteringMicelleSupercritical fluidRandom coildescription
In this paper we report a SANS investigation of micelle formation by fluorocarbon-hydrocarbon block copolymers in supercritical CO2(scCO2) at 313K. A sharp unimer-micelle transition is obtained due to the tuning of the solvating ability of scCO2 by profiling pressure. At high pressure the copolymer is in a monomeric state with a random coil structure. By lowering the pressure aggregates are formed with the hydrocarbon segments forming the core and the fluorocarbon segments forming the corona of spherical aggregates. This aggregate-unimer transition is driven by the gradual penetration of CO2 molecules toward the core of the aggregate and is critically related to the density of the solvent, thus suggesting the definition of a critical micellization density (CMD).
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-01-01 | AIP Conference Proceedings |