TITLE

QENS from polymeric micelles in supercritical CO[sub 2]

AUTHOR(S)
Triolo, R.; Arrighi, V.; Triolo, A.; Migliardo, P.; Magazu`, S.; McClain, J. B.; Betts, D.; DeSimone, J. M.; Middendorf, H. D.
PUB. DATE
April 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 513 Issue 1, p234
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report QENS measurements from PS-b-PFOA aggregates in supercritical CO[sub 2]. These consist of dense cores of CO[sub 2]-insoluble polystyrene surrounded by a ‘corona’ of PFOA surfactant molecules whose CO[sub 2]-philic groups interface with supercritical CO[sub 2]. Lineshapes are dominated by localized diffusive modes and segmental dynamics of the anchored, finite-length PFOA chains. For Q∼0.6 Å[sup -1], we obtain effective diffusion coefficients of approx. 0.8×10[sup -6] cm[sup 2]/sec. At higher Q, a single component is not sufficient as shown by excess intensity on the flanks. For Q>1.5 Å[sup -1], the wings reflect contributions due to a distribution of faster, more localized chain modes. © 2000 American Institute of Physics.
ACCESSION #
6028443

 

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