Self-assembly of triblock copolymers in aqueous solution

Vista sencilla de ítem
dc.contributor.authorUrbano, Bruno
dc.contributor.authorSilva, Patricio
dc.contributor.authorOlea, Andrés F.
dc.contributor.authorFuentes, Irma
dc.contributor.authorMartínez, Francisco
dc.date.accessioned2013-10-22T18:50:37Z
dc.date.accessioned2016-05-24T20:22:11Z
dc.date.available2013-10-22T18:50:37Z
dc.date.available2016-05-24T20:22:11Z
dc.date.issued2008
dc.descriptionIndexación: Scielo
dc.description.abstractThe aggregation of PE4VP-b-PS-b-PE4VP block copolymers was studied in aqueous solution. Triblock copolymers P4VP-b-PS-b-P4VP were synthesized by sequential anionic polymerization of poly(styrene) and poly(4-vinylpirydine) using sodium naphthalene as a bifunctional initiator. Subsequently, the 4-vinylpyridine units were quaternized with ethyl bromide to obtain cationic PE4VP-b-PS-b-PE4VP block copolymers. Both star and crew-cut micelles were formed. The concentrations at which micelles are formed cmc were determined, by steady-state and time-resolved fluorescence probing methods, as a function of quatemization degree. The results indicate that cmc of crew-cut micelles increases with increasing charge density of the PE4VP blocks. For star micelles there is not a clear dependency of cmc with the percentage of quatemization. The lifetime of pyrene fluorescence and the ratio I1/I3 were determined at concentrations of copolymers well above the cmc, and the results show that the location of pyrene into the micelle changes with the charge density of the micelle corona. The micropolarity sensed by pyrene decreases with increasing quatemization degree. The presence of aggregates was confirmed by transmission electronic microscopy.en
dc.description.urihttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072008000200013&lng=es&nrm=iso
dc.identifier.citationJournal of the Chilean Chemical Society, vol. 53 n° 2, 2008.
dc.identifier.issnISSN: 0717-9707
dc.identifier.otherDOI: 10.4067/S0717-97072008000200013
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/1939
dc.language.isoen
dc.publisherSociedad Chilena de Química
dc.rights.holder© 2012 Sociedad Chilena de Química
dc.subjectTriblock copolymers
dc.subjectCritical micelle concentration
dc.subjectMicelles
dc.subjectFluorescence probing methods
dc.subjectPyrene
dc.titleSelf-assembly of triblock copolymers in aqueous solution
dc.typeArtículo
Archivos
Bloque original
Mostrando 1 - 1 de 1
Miniatura
Nombre:
14. Urbano_self-assembly.pdf
Tamaño:
958.25 KB
Formato:
Adobe Portable Document Format
Descripción:
Descargar
Bloque de licencias
Mostrando 1 - 1 de 1
No hay miniatura disponible
Nombre:
license.txt
Tamaño:
1.71 KB
Formato:
Item-specific license agreed upon to submission
Descripción:
Descargar
Colecciones
FCE - Artículos de Revista