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Journal Article

Polymer gels and brushes at surfaces

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons48919

Vilgis,  Thomas A.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48114

Johner,  A.
MPI for Polymer Research, Max Planck Society;

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Citation

Vilgis, T. A., Joanny, J. F., & Johner, A. (2003). Polymer gels and brushes at surfaces. Macromolecular Symposia, 200(1), 67-80.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-638E-3
Abstract
We discuss the adsorption of polymer gels on flat surfaces. Even in cases of complete wetting, where the spreading power S is positive and where an equivalent liquid would spread, the elastic stresses due to the gel deformation upon adsorption oppose spreading. The competition between elasticity characterized by the bulk shear modulus G and capillarity, characterized by the spreading power S, defines a typical length scale 1 = S/G for the deformation in the gel. Macroscopic gels larger than 1 deform only at their edges over a region of size 1. Microscopic gels show a finite deformation despite the elastic stresses. These results can be compared to confined polymer brushes.