6533b7d8fe1ef96bd126acca
RESEARCH PRODUCT
Industrial applications of the aggregation of block copolymers in supercritical CO 2 : a SANS study
James B. McclainAlessandro TrioloRichard K. HeenanFabio TrioloF. Lo CelsoJoseph M. DesimoneHeinz AmenitschRoberto Triolosubject
chemistry.chemical_classificationMaterials scienceSupercritical carbon dioxideGeneral ChemistryPolymerNeutron scatteringSupercritical fluidSolventHydrocarbonchemistryChemical engineeringAmphiphilePolymer chemistryCopolymerGeneral Materials Sciencedescription
Industrial applications of supercritical carbon dioxide (scCO2) rely upon the rather selective and easily adjustable solvent ability of CO2. CO2 near the critical point is a poor solvent for high molecular weight (HMW) hydrocarbon polymers, while it is a very good solvent for amorphous fluorinated polymers. By increasing the pressure, CO2 becomes a good solvent even for HMW hydrogenated chains. Specially engineered amphiphilic di-block copolymers, with CO2-philic and CO2-phobic portions, are expected to undergo trough a monomer–aggregate transition when the solvent density of the scCO2 changes. Here small-angle neutron scattering (SANS) results are reported for a block copolymer dissolved in liquid and supercritical CO2. Time-resolved small-angle X-ray scattering (TR-SAXS) results are also reported.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2002-12-01 | Applied Physics A: Materials Science & Processing |