Article (Scientific journals)
Normal and shear forces between a polyelectrolyte brush and a solid surface
Kampf, Nir; Gohy, Jean-François; Jérôme, Robert et al.
2005In Journal of Polymer Science. Part B, Polymer Physics, 43 (2), p. 193-204
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Abstract :
[en] The diblock copolymer poly(methyl methacrylate)-b-poly(sodium sulfonated glycidyl methacrylate) (PMMA-b-PSGMA) was end-attached by its hydrophobic block (PMMA) onto mica hydrophobized by a stearic trimethylammonium iodide (STAI) layer, to form a polyelectrolyte brush immersed in water. With a surface force balance (SFB), we extended earlier measurements between two such brush layers for the case of normal and shear forces at different shear rates, surface separation, and compressions between one mica surface coated with STAI or a STAI-diblock layer against a bare mica surface. After coating one of the surfaces with STAI, a long range attraction that results in a jump into an adhesive flat contact between the hydrophobic and hydrophilic surfaces was observed. A very different behavior was seen after forming the polyelectrolyte brush on the STAI-coated surface. The long range attraction was replaced by repulsion, accompanied by very low friction during shear (ca. three orders of magnitude lower than with adsorbed polyelectrolytes). On further compression, a weak attraction to the adhesive contact was observed. From the final surface-surface contact separation, we deduce that most of the polyelectrolyte diblock brush layer was squeezed out from the gap, leaving the STAI layer and a small amount of the polymer attached to the surface. Stick-sliding behavior was seen while applying shear, suggesting a dissipation mechanism caused by the trapped polyelectrolyte.
Research center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry
Materials science & engineering
Author, co-author :
Kampf, Nir;  Weizmann Institute of Science, Rehovot, Israel > Department of Materials and 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)
Klein, Jacob;  Weizmann Institute of Science, Rehovot , Israel and Oxford University, UK > Department of Materials and Interfaces (Rehovot) > Physical and Theoretical Chemistry Laboratory (Oxoford)
Language :
English
Title :
Normal and shear forces between a polyelectrolyte brush and a solid surface
Publication date :
15 January 2005
Journal title :
Journal of Polymer Science. Part B, Polymer Physics
ISSN :
0887-6266
eISSN :
1099-0488
Publisher :
John Wiley & Sons Inc, Hoboken, United States - New Jersey
Volume :
43
Issue :
2
Pages :
193-204
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 13 February 2009

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