ORBi: Mahltig Boris - Adsorption and structure formation of the weak polyelectrolytic diblock copolymer, PVP-b-PDMAEMA

Reference : Adsorption and structure formation of the weak polyelectrolytic diblock copolymer, PVP-b...


	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/2268/9191

Title :	Adsorption and structure formation of the weak polyelectrolytic diblock copolymer, PVP-b-PDMAEMA
Language :	English
Author, co-author :	Mahltig, Boris [Institut für Polymerforschung, Dresden, Germany > > > >]
	Gohy, Jean-François [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Antoun, Sayed [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Jérôme, Robert [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Stamm, Manfred [Institut für Polymerforschung, Dresden, Germany > > > >]
Publication date :	Jun-2002
Journal title :	Colloid and Polymer Science
Publisher :	Springer
Volume :	280
Issue/season :	6
Pages :	495-502
Audience :	International
ISSN :	0303-402X
City :	New York
Abstract :	[en] This paper reports on the pH-dependent adsorption of weak the polyelectrolytic diblock copolymer poly(2-vinylpyridine)-block-poly(dimethylaminoethyl methacrylate), (PVP-b-PDMAEMA). Aqueous PVP-b-PDMAEMA solutions have been adsorbed on alkaline pretreated silicon substrates. Altogether two copolymers differing in block ratio and molecular weight were used for the investigations. While the electrical charge of both samples in solution was investigated by electrophoretic measurements, the adsorbed polymer layers were studied with ellipsometry and atomic force microscopy (AFM). Depending on pH the electrical charge of both blocks of the diblock copolymer varied. Three different regimes have been identified. Under acidic conditions at pH < 5, both blocks are mainly positively charged. At medium pH between 5 and 8, only the PDMAEMA block is positively charged. At pH > 8, both blocks are nearly uncharged and a polymer precipitation occurred in solution. Each of these pH regimes was characterized by a specific adsorption behaviour leading to two adsorption maxima at acidic and alkaline pH values, while at medium pH a plateau in the adsorbed amount was observed. Moreover, the structures of the polyelectrolytes formed on the substrate after adsorption were specific to each of the three pH regimes.
Research units :	Center for Education and Research on Macromolecules (CERM)
Funders :	The DFG-Schwerpunkt ‘‘Polyelektrolyte (grant Sta 324/5–2) ; Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; The European Science Foundation (ESF) in the frame of the SUPERNET program
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/9191
DOI :	10.1007/s00396-001-0628-1
Other URL :	http://www.springerlink.com/content/793mfhxf97gyykv7/fulltext.pdf
Commentary :	The original publication is available at http://www.springerlink.com/content/793mfhxf97gyykv7/fulltext.pdf. The authors acknowledge Colloid and Polymer Science (Springer) for allowing them to archive this paper.

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