[en] The adsorption of amphiphilic poly(ethylene oxide)-b-poly(epsilon-caprolactone) and poly(ethylene oxide)-b-poly(gamma-methyl-epsilon-caprolactone) copolymers in aqueous solution on silica and glass surfaces has been investigated by flow microcalorimetry, small-angle neutron scattering (SANS), surface forces, and complementary techniques. The studied copolymers consist of a poly(ethylene oxide) (PEO) block of M(n) = 5000 and a hydrophobic polyester block of poly(epsilon-caprolactone) (PCL) or poly(gamma-methyl-epsilon-caprolactone) (PMCL) of M(n) in the 950-2200 range. Compared to homoPEO, the adsorption of the copolymers is significantly increased by the connection of PEO to an aliphatic polyester block. According to calorimetric experiments, the copolymers interact with the surface mainly through the hydrophilic block. At low surface coverage, the PEO block interacts with the surface such that both PEO and PCL chains are exposed to the aqueous solution. At high surface coverage, a dense copolymer layer is observed with the PEO blocks oriented toward the solution. The structure of the copolymer layer has been analyzed by neutron scattering using the contrast matching technique and by tapping mode atomic force microscopy. The experimental observations agree with the coadsorption of micelles and free copolymer chains at the interface.
Research center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering Chemistry
Author, co-author :
Vangeyte, Patrick; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Leyh, Bernard ; Université de Liège - ULiège > Department of Chemistry > Laboratoire de dynamique moléculaire
Rojas, O. J.; North Carolina State University > Department of Wood and Paper Science
Claesson, P. M.; Royal Institute of Technology, Stockholm, Sweden > Department of Chemistry > Surface Chemistry
Heinrich, M.; Forschungszentrum Jülich, Germany > Institut für Festkörperforschung
Auvray, Loïc; Laboratoire Léon Brillouin (Saclay) and University of Evry, France > Laboratoire Matériaux Polymères aux Interfaces (Evry)
Willet, Nicolas ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
Adsorption of poly(ethylene oxide)-b-poly(epsilon-caprolactone) copolymers at the silica-water interface
Publication date :
29 March 2005
Journal title :
Langmuir
ISSN :
0743-7463
eISSN :
1520-5827
Publisher :
Amer Chemical Soc, Washington, United States - Washington
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE] The European Commission Access to Research Infrastructures Action of the Improving Human Potential Program (HPRI) The Laboratoire Léon Brillouin (Saclay, France) (Contract HPRI-CT-1999-00032)
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