QENS from polymer aggregates in supercritical CO2

R. Triolo, V. Arrighi, A. Triolo, P. Migliardo, S. Magazù, J. B. McClain, D. Betts, J. M. Desimone, H. D. Middendorf

Research output: Contribution to journalArticle

9 Citations (Scopus)

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 angstrom-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 angstroms-1, the wings reflect contributions due to a distribution of faster, more localized chain modes.

Original languageEnglish
Pages (from-to)386-387
Number of pages2
JournalPhysica B: Condensed Matter
Volume276-278
DOIs
Publication statusPublished - Mar 2000
Event2nd European Conference on Neutron Scattering - Budapest, Hung
Duration: 1 Sep 19994 Sep 1999

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