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Density functional study of surface forces in solutions containing star-shaped polymers

Woodward, C E and Forsman, Jan LU (2004) In Macromolecules 37(18). p.7034-7041
Abstract
Density functional theory is used to study polymer solutions between surfaces in equilibrium with a bulk solution. We investigate the effect on the surface interaction free energy of having star polymers with different numbers of arms. In addition, we consider the role played by the strength of the adsorption potential and the concentration of the polymer molecules. The interaction free energy is found to scale quite well with the number of arms on the stars, and the separation dependence of the interaction scales approximately with the radius of gyration. When the adsorption potential is weak, the polymer molecules are depleted. A free energy barrier is nevertheless present-a phenomenon often referred to as depletion stabilization. The... (More)
Density functional theory is used to study polymer solutions between surfaces in equilibrium with a bulk solution. We investigate the effect on the surface interaction free energy of having star polymers with different numbers of arms. In addition, we consider the role played by the strength of the adsorption potential and the concentration of the polymer molecules. The interaction free energy is found to scale quite well with the number of arms on the stars, and the separation dependence of the interaction scales approximately with the radius of gyration. When the adsorption potential is weak, the polymer molecules are depleted. A free energy barrier is nevertheless present-a phenomenon often referred to as depletion stabilization. The barrier scales with the number of arms on the star polymers. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Macromolecules
volume
37
issue
18
pages
7034 - 7041
publisher
The American Chemical Society
external identifiers
  • wos:000223677600054
  • scopus:4544224332
ISSN
0024-9297
DOI
10.1021/ma035508b
language
English
LU publication?
yes
id
25a01af9-1272-4a27-a2b1-5be572610d90 (old id 139605)
date added to LUP
2007-07-17 14:21:05
date last changed
2017-05-21 03:35:33
@article{25a01af9-1272-4a27-a2b1-5be572610d90,
  abstract     = {Density functional theory is used to study polymer solutions between surfaces in equilibrium with a bulk solution. We investigate the effect on the surface interaction free energy of having star polymers with different numbers of arms. In addition, we consider the role played by the strength of the adsorption potential and the concentration of the polymer molecules. The interaction free energy is found to scale quite well with the number of arms on the stars, and the separation dependence of the interaction scales approximately with the radius of gyration. When the adsorption potential is weak, the polymer molecules are depleted. A free energy barrier is nevertheless present-a phenomenon often referred to as depletion stabilization. The barrier scales with the number of arms on the star polymers.},
  author       = {Woodward, C E and Forsman, Jan},
  issn         = {0024-9297},
  language     = {eng},
  number       = {18},
  pages        = {7034--7041},
  publisher    = {The American Chemical Society},
  series       = {Macromolecules},
  title        = {Density functional study of surface forces in solutions containing star-shaped polymers},
  url          = {http://dx.doi.org/10.1021/ma035508b},
  volume       = {37},
  year         = {2004},
}