English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/50924
COMPARTIR / IMPACTO:
Estadísticas
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Título

Unexpected PDMS behavior in segregated cylindrical and spherical nanophases of PS-PDMS asymmetric diblock copolymers

AutorValle-Carrandi, L. del; Alegría, Ángel ; Arbe, Arantxa ; Colmenero de León, Juan
Fecha de publicación2012
EditorAmerican Chemical Society
CitaciónMacromolecules 45(1): 491-502 (2012)
ResumenThe structure and dynamics of the poly(dimethylsiloxane) (PDMS) segregated nanophase in block copolymers with polystyrene (PS) has been analyzed in detail by combining wide- and small-angle X-ray diffraction, infrared absorption, differential scanning calorimetry, and dielectric relaxation spectroscopy. In particular, we have investigated PS-rich PS-PDMS diblocks where the minority PDMS phase is segregated into cylindrical and spherical regions with diameter in the range 10-20 nm and compared the results with those previously reported on symmetric diblocks with lamellar phases of similar size. It is found that in these highly segregated cylindrical and spherical regions in the copolymers PDMS presents a rather unexpected behavior as probed by X-ray diffraction, infrared absorption, differential scanning calorimetry, and dielectric relaxation spectroscopy. Structural techniques indicate poor packing of the PDMS segments, whereas calorimetric experiments evidence both strong suppression of PDMS crystallization and significant reduction of the glass transition temperature range. Connected with that, the dielectric relaxation probing the PDMS segmental dynamics is much more heterogeneous and markedly faster not only than that observed for PDMS in lamellar nanophases but more strikingly than that of PDMS melt. 2011 American Chemical Society.
URIhttp://hdl.handle.net/10261/50924
DOI10.1021/ma202107m
Identificadoresdoi: 10.1021/ma202107m
issn: 0024-9297
Aparece en las colecciones: (CFM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
accesoRestringido.pdf15,38 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


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