ORBi: Vangeyte Pattrick - Self-assembly of poly(ethylene oxide)-b-poly(epsilon-caprolactone) copolymers in aqueous solution

Reference : Self-assembly of poly(ethylene oxide)-b-poly(epsilon-caprolactone) copolymers in aqueous...


	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/2268/8144

Title :	Self-assembly of poly(ethylene oxide)-b-poly(epsilon-caprolactone) copolymers in aqueous solution
Language :	English
Author, co-author :	Vangeyte, Pattrick [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Leyh, Bernard [University of Liège (ULg) > Department of Chemistry > Laboratoire de Dynamique Moléculaire > >]
	Heinrich, M. [Institut für Festkörperforschung, Forschungszentrum Jülich, Germany > > > >]
	Grandjean, Jean [University of Liège (ULg) > Department of Chemistry > Chimie organique et spectroscopie multinucléaire (COSM) > >]
	Bourgaux, C. [University of Paris-Sud, Orsay, France > > Laboratoire pour l‘Utilisation du Rayonnement Electromagnétique > >]
	Jérôme, Robert [Université de Liège - ULg > > Centre d'études et de rech. sur les macromolécules (CERM) >]
Publication date :	28-Sep-2004
Journal title :	Langmuir
Publisher :	Amer Chemical Soc
Volume :	20
Issue/season :	20
Pages :	8442-8451
Audience :	International
ISSN :	0743-7463
City :	Washington
Keywords :	[en] self-assembly in solution ; micelle
Abstract :	[en] The associative behavior of monodisperse diblock copolymers consisting of a hydrophilic poly(ethylene oxide) block and a hydrophobic poly(epsilon-caprolactone) or poly(gamma-methyl-epsilon-caprolactone) block has been studied in aqueous solution. Copolymers have been directly dissolved in water. The solution properties have been studied by surface tension, in relation to mesoscopic analyses by NMR (self-diffusion coefficients), transmission electron microscopy, and small-angle neutron and X-ray scattering. The experimental results suggest that micellization occurs at low concentration (approximately 0.002 wt %) and results in a mixture of unimers and spherical micelles that exchange slowly. The radius of the micelles has been measured (ca. 11 nm), and the micellar substructure has been extracted from the fitting of the SANS data with two analytical models. The core radius and the aggregation number change with the hydrophobic block length according to scaling laws as reported in the scientific literature. The poly(ethylene oxide) blocks are in a moderately extended conformation in the corona, which corresponds to about 25% of the completely extended chain. No significant modification is observed when poly(gamma-methyl-epsilon-caprolactone) replaces poly(epsilon-caprolactone) in the diblocks.
Research units :	Center for Education and Research on Macromolecules (CERM)
Funders :	Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA ; Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; the European Community-Access to Research Infrastructures action of the ImprovingHumanPotential program (HPRI)
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/8144
DOI :	10.1021/la049695y
Other URL :	http://pubs.acs.org/doi/pdf/10.1021/la049695y

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