TY - JOUR
T1 - QENS from polymer aggregates in supercritical CO2
AU - Triolo, R.
AU - Arrighi, V.
AU - Triolo, A.
AU - Migliardo, P.
AU - Magazù, S.
AU - McClain, J. B.
AU - Betts, D.
AU - Desimone, J. M.
AU - Middendorf, H. D.
PY - 2000/3
Y1 - 2000/3
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0033902202&partnerID=8YFLogxK
U2 - 10.1016/S0921-4526(99)01500-8
DO - 10.1016/S0921-4526(99)01500-8
M3 - Article
SN - 0921-4526
VL - 276-278
SP - 386
EP - 387
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
T2 - 2nd European Conference on Neutron Scattering
Y2 - 1 September 1999 through 4 September 1999
ER -