English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/102331
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Citado 6 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

End-to-end vector dynamics of nonentangled polymers in lamellar block copolymer melts: The role of junction point motion

Autor Lund, Reidar; Barroso-Bujans, Fabienne ; Slimani, Mohammed Zakaria ; Moreno Segurado, Ángel J. ; Willner, Lutz; Richter, Dieter; Alegría, Ángel ; Colmenero de León, Juan
Fecha de publicación 2013
EditorAmerican Chemical Society
Citación Macromolecules 46(18): 7477-7487 (2013)
ResumenBy using dielectric spectroscopy, we investigate the chain dynamics of nonentangled polyisoprene (PI) under soft confinement in lamellar domains of block copolymer melts with polydimethylsiloxane (PDMS). The data show a dramatic difference in the end-to-end vector dynamics of the PI blocks as compared not only with that of the corresponding homopolymer PI chains but also with respect to previous results for the same blocks under soft confinement in cylindrical domains. Two contributions to the dielectric normal mode relaxation are detected. The data are analyzed by means of a model including contributions from internal chain modes (accounting for the fastest component) and a slow component attributed to the junction point dynamics. The contribution of the internal chain modes is modeled according to the analysis of the Rouse modes obtained from simulations of a generic bead-spring model for strongly segregated symmetric diblock copolymers. In this way it is shown that the internal chain modes of the blocks have time scales close to those expected from the homopolymer chain independently of the structural details. In contrast, the contribution attributed to the junction point dynamics depends critically on minor structural differences. We interpret these findings as a result of the presence of fast moving defects and/or grain boundaries in the lamellar structures formed by these relatively short, nonentangled diblock copolymers. © 2013 American Chemical Society.
Versión del editorhttp://dx.doi.org/10.1021/ma401162b
URI http://hdl.handle.net/10261/102331
DOI10.1021/ma401162b
Identificadoresdoi: 10.1021/ma401162b
issn: 0024-9297
e-issn: 1520-5835
Aparece en las colecciones: (CFM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
End-to-end.pdf4,25 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.