ORBi: Gohy Jean-François - pH Dependence of the morphology of aqueous micelles formed by polystyrene-block-poly(2-vinylpyridine)-block-poly(ethylene oxide) copolymers

Reference : pH Dependence of the morphology of aqueous micelles formed by polystyrene-block-poly(2-v...


	Document type :	Scientific journals : Article
	Discipline(s) :	Engineering, computing & technology : Materials science & engineering Physical, chemical, mathematical & earth Sciences : Chemistry
	To cite this reference:	http://hdl.handle.net/2268/11523

Title :	pH Dependence of the morphology of aqueous micelles formed by polystyrene-block-poly(2-vinylpyridine)-block-poly(ethylene oxide) copolymers
Language :	English
Author, co-author :	Gohy, Jean-François [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Willet, Nicolas [university of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Varshney, Sunil K [Polymer Source, Dorval, Canada > > > >]
	Zhang, Jian-Xin [Polymer Source, Dorval, Canada > > > >]
	Jérôme, Robert [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Publication date :	13-Aug-2002
Journal title :	e-Polymers
Publisher :	European Polymer Federation
Issue/season :	35
Pages :	1-10
Peer reviewed :	Yes
Audience :	International
ISSN :	1618-7229
City :	Strasbourg
Keywords :	[en] self-assembly in solution ; micelle ; stimuli responsive micelle
Abstract :	[en] The morphology of micelles formed by two polystyrene-block-poly(2-vinylpyridine)- block-poly(ethylene oxide) (PS-b-P2VP-b-PEO) copolymers was studied in water by dynamic light scattering and transmission electron microscopy. Spherical micelles were observed that consist of a PS core, a P2VP shell and a PEO corona. The characteristic size of core, shell and corona depends on the copolymer composition. An important increase in micellar size occurs at pH < 5 as a result of P2VP block protonation. The reversibility of this pH effect depends on copolymer composition, too. The conformation of the PEO block plays an important role in this pH driven morphological transition.
Research units :	Center for Education and Research on Macromolecules (CERM)
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; The European Science Foundation (ESF) in the frame of the SUPERNET program ; Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/11523
Other URL :	http://www.e-polymers.org/journal/list.cfm#

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