[en] The adsorption of poly(tert-butylmethacrylate)-block-poly(2-(dimethylamino-ethyl) methacrylate) (PtBUMA-b-PDMAEMA) was studied by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) analysis performed on dried samples. The copolymer was dissolved in toluene at concentrations below (0.01 wt%) and above (0.05 and 1 wt%) the CMC; silicon (SiOH) and CH3-grafted silicon (SiCH3) were used as substrates. Whatever the concentration and the substrate, a layer of individual copolymer molecules, 1.5-3 nm thick, formed rapidly. The adsorbed amount was slightly higher and the resistance to AFM tip scraping was stronger on SiOH than oil SiCH3. This is attributed to hydrogen bonding between the PDMAEMA block and the OH groups of the silicon surface, leading to polarization of the adsorbed layer. Above the CMC, on SiOH, randomly scattered dot-like features (about 5 nm high) observed by AFM were attributed to individual micelles, which were not displaced by drying. On SiCH3, the particles found on the top of the adsorbed layer were micelle aggregates, about 50 nm thick, the lateral size of which was strongly influenced by the rate of drying. This further difference between SiCH3 and SiOH is tentatively attributed to the exposure of PDMAEMA by the adsorbed layer formed on SiCH3, while only PtBUMA would be exposed by the layer adsorbed on SiOH. The red blood cell shape and the size of the micelles observed in single layers indicate that the PtBUMA corona was not made compact as a result of drying, (C) 2003 Elsevier Inc. All rights reserved.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering Chemistry
Author, co-author :
De Cupere, V. M.; Université catholique de Louvain (UCL) > Unité de Chimie des Interfaces
Gohy, Jean-François; 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)
Rouxhet, P. G.; Université catholique de Louvain (UCL) > Unité de Chimie des Interfaces
Language :
English
Title :
Influence of substrate hydrophobicity on the adsorption of an amphiphilic diblock copolymer
Publication date :
01 March 2004
Journal title :
Journal of Colloid and Interface Science
ISSN :
0021-9797
eISSN :
1095-7103
Publisher :
Academic Press Inc Elsevier Science, San Diego, United States - California
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique F.R.S.-FNRS - Fonds de la Recherche Scientifique FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture The Communauté Française de Belgique (Concerted Research Action)
Commentary :
The authors acknowledge Progress in Colloid and Polymer Science (Elsevier) for allowing them to archive this paper.
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Bibliography
Emoto K., Nagasaki Y., Kataoka K. Langmuir. 15:1999;5212-5218.
Huang N.-P., Csucs G., Emoto K., Nagasaki Y., Kataoka K., Textor M., Spencer D. Langmuir. 18:2002;252-258.
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