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Título: | Neutron scattering investigation of a diluted blend of poly(ethylene oxide) in polyethersulfone |
Autor: | Genix, A. C.; Arbe, Arantxa CSIC ORCID; Arrese-Igor, Silvia CSIC ORCID ; Colmenero de León, Juan CSIC ORCID; Richter, Dieter; Frick, Bernhard; Deen, P. P. | Palabras clave: | Freezing Glass transition Neutron diffraction Polymer blends Short-range order |
Fecha de publicación: | 8-may-2008 | Editor: | American Institute of Physics | Citación: | Journal of Chemical Physics 128, 184901 (2008). | Resumen: | By 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. | Descripción: | 11 pages.-- PACS nrs.: 61.41.+e, 64.70.P-.-- PMID: 18532842 [PubMed]. | Versión del editor: | http://dx.doi.org/10.1063/1.2918497 | URI: | http://hdl.handle.net/10261/7418 | DOI: | 10.1063/1.2918497 | ISSN: | 0021-9606 |
Aparece en las colecciones: | (CFM) Artículos |
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