Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/10549
DC FieldValueLanguage
dc.contributor.authorCosta, Telma-
dc.contributor.authorSchillén, Karin-
dc.contributor.authorMiguel, Maria da G.-
dc.contributor.authorLindman, Björn-
dc.contributor.authorMelo, J. Seixas de-
dc.date.accessioned2009-07-08T08:35:34Z-
dc.date.available2009-07-08T08:35:34Z-
dc.date.issued2009-05-07-
dc.identifier.citationThe Journal of Physical Chemistry B. 113:18 (2009) 6194-6204en_US
dc.identifier.issn1520-6106-
dc.identifier.urihttp://hdl.handle.net/10316/10549-
dc.description.abstractBy using absorption and fluorescence (steady-state and time-resolved) techniques, the interaction between a poly(acrylic acid) (PAA), randomly grafted with pyrene (Py) units (PAAMePy55), and a triblock copolymer of poly(ethylene oxide) and poly(propylene oxide) (EO20PO68EO20, P123) was investigated. From the fluorescence data, it is shown that upon addition of P123 a decrease of the (pyrene−pyrene, Py−Py) intramolecular association, i.e., a decrease of dynamic and static excimer formation, is observed. Time-resolved fluorescence data reveal the existence of two types of monomers (monomers that are able to form excimer, MAGRE, and isolated monomers) and two excimers. Addition of P123 causes also an increase of the amount of isolated Py monomers. The overall fluorescence data suggest that the PAAMePy55 and the P123 block copolymer associate strongly at low pH, leading to the formation of P123 micelles surrounded by one PAAMePy55 chain, where the pyrene groups are located at the PPO/PEO interface of the P123 micelles. Steady-state fluorescence results also showed that an excess of P123 micelles in solution is required for the association to occur. At high pH (pH 9 and above) the situation is less clear. The steady-state (particularly in the I1/I3 ratio) and time-resolved fluorescence results indicate a contact between the pyrene groups and PEO, which then would imply that there may be an interaction, but much weaker than at low pH.en_US
dc.language.isoengen_US
dc.publisherAmerican Chemical Societyen_US
dc.rightsopenAccesseng
dc.titleAssociation of a Hydrophobically Modified Polyelectrolyte and a Block Copolymer Followed by Fluorescence Techniquesen_US
dc.typearticleen_US
dc.identifier.doi10.1021/jp8093879-
uc.controloAutoridadeSim-
item.fulltextCom Texto completo-
item.grantfulltextopen-
item.languageiso639-1en-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.orcid0000-0002-1601-5501-
crisitem.author.orcid0000-0002-7493-9112-
crisitem.author.orcid0000-0001-9708-5079-
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais
Files in This Item:
File Description SizeFormat
Association of a Hydrophobically Modified Polyelectrolyte.pdf491.01 kBAdobe PDFView/Open
Show simple item record

SCOPUSTM   
Citations

14
checked on May 29, 2020

WEB OF SCIENCETM
Citations 5

14
checked on Mar 2, 2021

Page view(s)

317
checked on Sep 14, 2021

Download(s) 50

483
checked on Sep 14, 2021

Google ScholarTM

Check

Altmetric

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.