English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/101815
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Citado 11 veces en Web of Knowledge®  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)
Título

Heterogeneity of the segmental dynamics in cylindrical and spherical phases of diblock copolymers

Autor Slimani, Mohammed Zakaria ; Moreno Segurado, Ángel J. ; Colmenero de León, Juan
Fecha de publicación 2012
EditorAmerican Chemical Society
Citación Macromolecules 45(21): 8841-8852 (2012)
ResumenWe have performed simulations of a simple bead-spring model for cylindrical and spherical phases of diblock copolymers. We have analyzed in detail the dynamic heterogeneity of the structural α-relaxation of the component confined in the minority domains. In analogy with previous investigations on the lamellar phase of the same bead-spring model, the analysis reveals moderate gradients of mobility in the investigated temperature range, which qualitatively probes time scales up to 100 ns. Thus, α-relaxation times measured at different distances from the domain center spread over less than one decade. The spatial extension of the gradients of mobility is apparently consistent with that previously observed in the lamellar phase of the same model. Gradients of mobility do not seem to be related to gradients of density within the domains, which are indeed absent. We have performed an analysis of self- and effective concentrations, a concept usually invoked to explain the α-relaxation in polymer mixtures and that has been recently adapted to the analysis of experimental data of diblock copolymers in ordered phases. The simulation results reveal a strong disagreement with the proposed empirical relation between self- and effective concentration, as well as with the Flory-Fox mixing rule for the dynamics. This suggests that the use of these relations may bias the analysis of experimental data. © 2012 American Chemical Society.
Versión del editorhttp://dx.doi.org/10.1021/ma301388j
URI http://hdl.handle.net/10261/101815
DOI10.1021/ma301388j
Identificadoresdoi: 10.1021/ma301388j
issn: 0024-9297
e-issn: 1520-5835
Aparece en las colecciones: (CFM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Heterogeneity-of-the-segmental.pdf4,96 MBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 



NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.