Interfacial rheology and conformations of triblock copolymers adsorbed onto the water-oil interface

The conformation and the dilatational properties of three non-ionic triblock PEO-PPO-PEO (where PEO is polyethyleneoxide and PPO is polypropyleneoxide) copolymers of different hydrophobicity and molecular weight were investigated at the water-hexane interface.The interfacial behavior of the copolyme...

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Autores: Ramírez del Amo, Pablo, Stocco, Antonio, Muñoz García, José, Miller, Reinhard
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2012
País:España
Recursos:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/134424
Acesso em linha:https://hdl.handle.net/11441/134424
https://doi.org/10.1016/j.jcis.2012.04.033
Access Level:acceso abierto
Palavra-chave:Adsorbed layer
Conformational transitions
Ellipsometry
Interfacial rheology
Non-ionic triblock copolymer
Oil-water interface
Pluronics
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spelling Interfacial rheology and conformations of triblock copolymers adsorbed onto the water-oil interfaceRamírez del Amo, PabloStocco, AntonioMuñoz García, JoséMiller, ReinhardAdsorbed layerConformational transitionsEllipsometryInterfacial rheologyNon-ionic triblock copolymerOil-water interfacePluronicsThe conformation and the dilatational properties of three non-ionic triblock PEO-PPO-PEO (where PEO is polyethyleneoxide and PPO is polypropyleneoxide) copolymers of different hydrophobicity and molecular weight were investigated at the water-hexane interface.The interfacial behavior of the copolymers was studied by combining dilatational rheology using the oscillating drop method and ellipsometry.From the dilatational rheology measurements the limiting elasticity values, E 0, of the Pluronics as function of surface pressure, Π, and adsorption time were obtained, i.e. E 0(t) and E 0(Π). Here, it is shown that E 0(t) depends on the number of PEO units and on the bulk concentration, showing maximum and minimum surface elasticity values which indicate conformational changes in the interfacial layer.Furthermore, in the framework of the polymer scaling law theory, conformational transitions were discussed in E 0 vs. Π plots. In a dilute regime (Π<14mNm -1) at the water-hexane interface, E 0=2Π fits well all the data, which indicates a two-dimensional " stretched chain" conformation. Increasing Π, two other interfacial transitions could take place. The different behavior of Pluronic copolymers could be also described by the local minima of E 0, which depends on the hydrophobicity of the copolymers.Conformational transitions observed by interfacial rheology were compared to ellipsometric data. Experimental results were discussed and explained on the basis of two- and three-dimensional copolymer structure taking into account that PPO chains could be partially immersed in hexane and water.Ministerio de Ciencia e Innovación CTQ2007-66157PPQElsevierIngeniería QuímicaMinisterio de Ciencia e Innovación (MICIN). España2012info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/134424https://doi.org/10.1016/j.jcis.2012.04.033reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésJournal of Colloid and Interface Science, 378, 135-143.CTQ2007-66157PPQhttps://doi.org/10.1016/j.jcis.2012.04.033info:eu-repo/semantics/openAccessoai:idus.us.es:11441/1344242026-06-17T12:51:07Z
dc.title.none.fl_str_mv Interfacial rheology and conformations of triblock copolymers adsorbed onto the water-oil interface
title Interfacial rheology and conformations of triblock copolymers adsorbed onto the water-oil interface
spellingShingle Interfacial rheology and conformations of triblock copolymers adsorbed onto the water-oil interface
Ramírez del Amo, Pablo
Adsorbed layer
Conformational transitions
Ellipsometry
Interfacial rheology
Non-ionic triblock copolymer
Oil-water interface
Pluronics
title_short Interfacial rheology and conformations of triblock copolymers adsorbed onto the water-oil interface
title_full Interfacial rheology and conformations of triblock copolymers adsorbed onto the water-oil interface
title_fullStr Interfacial rheology and conformations of triblock copolymers adsorbed onto the water-oil interface
title_full_unstemmed Interfacial rheology and conformations of triblock copolymers adsorbed onto the water-oil interface
title_sort Interfacial rheology and conformations of triblock copolymers adsorbed onto the water-oil interface
dc.creator.none.fl_str_mv Ramírez del Amo, Pablo
Stocco, Antonio
Muñoz García, José
Miller, Reinhard
author Ramírez del Amo, Pablo
author_facet Ramírez del Amo, Pablo
Stocco, Antonio
Muñoz García, José
Miller, Reinhard
author_role author
author2 Stocco, Antonio
Muñoz García, José
Miller, Reinhard
author2_role author
author
author
dc.contributor.none.fl_str_mv Ingeniería Química
Ministerio de Ciencia e Innovación (MICIN). España
dc.subject.none.fl_str_mv Adsorbed layer
Conformational transitions
Ellipsometry
Interfacial rheology
Non-ionic triblock copolymer
Oil-water interface
Pluronics
topic Adsorbed layer
Conformational transitions
Ellipsometry
Interfacial rheology
Non-ionic triblock copolymer
Oil-water interface
Pluronics
description The conformation and the dilatational properties of three non-ionic triblock PEO-PPO-PEO (where PEO is polyethyleneoxide and PPO is polypropyleneoxide) copolymers of different hydrophobicity and molecular weight were investigated at the water-hexane interface.The interfacial behavior of the copolymers was studied by combining dilatational rheology using the oscillating drop method and ellipsometry.From the dilatational rheology measurements the limiting elasticity values, E 0, of the Pluronics as function of surface pressure, Π, and adsorption time were obtained, i.e. E 0(t) and E 0(Π). Here, it is shown that E 0(t) depends on the number of PEO units and on the bulk concentration, showing maximum and minimum surface elasticity values which indicate conformational changes in the interfacial layer.Furthermore, in the framework of the polymer scaling law theory, conformational transitions were discussed in E 0 vs. Π plots. In a dilute regime (Π<14mNm -1) at the water-hexane interface, E 0=2Π fits well all the data, which indicates a two-dimensional " stretched chain" conformation. Increasing Π, two other interfacial transitions could take place. The different behavior of Pluronic copolymers could be also described by the local minima of E 0, which depends on the hydrophobicity of the copolymers.Conformational transitions observed by interfacial rheology were compared to ellipsometric data. Experimental results were discussed and explained on the basis of two- and three-dimensional copolymer structure taking into account that PPO chains could be partially immersed in hexane and water.
publishDate 2012
dc.date.none.fl_str_mv 2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/11441/134424
https://doi.org/10.1016/j.jcis.2012.04.033
url https://hdl.handle.net/11441/134424
https://doi.org/10.1016/j.jcis.2012.04.033
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Journal of Colloid and Interface Science, 378, 135-143.
CTQ2007-66157PPQ
https://doi.org/10.1016/j.jcis.2012.04.033
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:idUS. Depósito de Investigación de la Universidad de Sevilla
instname:Universidad de Sevilla (US)
instname_str Universidad de Sevilla (US)
reponame_str idUS. Depósito de Investigación de la Universidad de Sevilla
collection idUS. Depósito de Investigación de la Universidad de Sevilla
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.301629

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