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RESEARCH PRODUCT
QENS from polymer aggregates in supercritical CO2
R. TrioloJames B. McclainAlessandro TrioloP. MigliardoDouglas E. BettsH.d. MiddendorfSalvatore MagazùValeria ArrighiJoseph M. Desimonesubject
chemistry.chemical_classificationMaterials scienceSingle componentIncoherent scatterPolymerCondensed Matter PhysicsSupercritical fluidElectronic Optical and Magnetic MaterialsNuclear magnetic resonancechemistryChemical physicsElectrical and Electronic EngineeringDiffusion (business)Intensity (heat transfer)Line (formation)description
Abstract We report QENS measurements from PS-b-PFOA aggregates in supercritical CO2. Line shapes are dominated by localized diffusive modes and segmental dynamics of the anchored, finite-length PFOA chains. For Q⩽0.6 A−1, we obtain effective diffusion coefficients of ≅0.8 10−6 cm2/s. At higher Q, a single component is not sufficient as shown by excess intensity on the flanks. For Q⩾1.5 A−1, the wings reflect contributions due to a distribution of faster, more localized chain modes.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-03-01 | Physica B: Condensed Matter |