Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/50924
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Unexpected PDMS behavior in segregated cylindrical and spherical nanophases of PS-PDMS asymmetric diblock copolymers |
Autor: | Valle-Carrandi, L. del CSIC; Alegría, Ángel CSIC ORCID ; Arbe, Arantxa CSIC ORCID; Colmenero de León, Juan CSIC ORCID | Fecha de publicación: | 2012 | Editor: | American Chemical Society | Citación: | Macromolecules 45(1): 491-502 (2012) | Resumen: | The 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. | URI: | http://hdl.handle.net/10261/50924 | DOI: | 10.1021/ma202107m | Identificadores: | doi: 10.1021/ma202107m issn: 0024-9297 |
Aparece en las colecciones: | (CFM) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
accesoRestringido.pdf | 15,38 kB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
15
checked on 21-abr-2024
WEB OF SCIENCETM
Citations
13
checked on 27-feb-2024
Page view(s)
233
checked on 23-abr-2024
Download(s)
85
checked on 23-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.