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Neutron scattering investigation of a diluted blend of poly(ethylene oxide) in polyethersulfone

AutorGenix, A. C.; Arbe, Arantxa ; Arrese-Igor, Silvia ; Colmenero de León, Juan ; Richter, Dieter; Frick, Bernhard; Deen, P. P.
Palabras claveFreezing
Glass transition
Neutron diffraction
Polymer blends
Short-range order
Fecha de publicación8-may-2008
EditorAmerican Institute of Physics
CitaciónJournal of Chemical Physics 128, 184901 (2008).
ResumenBy using quasielastic neutron scattering (QENS) with isotopic labeling we have investigated the component dynamics in a miscible blend of polyethersulfone (PES) and poly(ethylene oxide) (PEO) with 75% content in weight of PES. Due to the large difference in the glass-transition temperatures, Tg's, of the two polymers (Tg_PEO ~ 220 K, Tg_PES ~ 382 K) the dynamic asymmetry in the system dramatically increases when approaching the average Tg of the blend, <Tg_blend>. For the fast (PEO) component, this leads to a behavior which hints a crossover from typical glass-forming liquidlike dynamics at high temperatures to confined dynamics close to <Tg_blend> induced by the freezing of the segmental motions of the slow PES. The features of the confined PEO motion observed by QENS are similar to those of the secondary γ-relaxation detected for pure (semicrystalline) PEO. A neutron diffraction study of the short-range order of the homopolymers and the blend suggests that this coincidence could be due to similarities in the intermolecular packing of PEO and PES polymers.
Descripción11 pages.-- PACS nrs.: 61.41.+e, 64.70.P-.-- PMID: 18532842 [PubMed].
Versión del editorhttp://dx.doi.org/10.1063/1.2918497
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