### Abstract

We study the interaction forces between two plates in a semi-dilute solution of polymers each having one weakly adsorbing end-group. We show that this system exhibits both repulsive and attractive interactions of comparable magnitude and well-separated length scales: when the plate separation is within a range of order the end-to-end distance of the end-adsorbed polymer, repulsion arises with a magnitude of ε_{Na3}^{Φ} where e is the end-adsorption energy, N is the degree of polymerization, a is the Kühn length and Φ the volume fraction of the polymer. This repulsion is due to desorption of the end-adsorbed chains. At plate separations of order the correlation length of the solution, a depletion attraction sets in with a magnitude that scales with the bulk osmotic pressure.

Original language | English (US) |
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Pages (from-to) | 1111-1121 |

Number of pages | 11 |

Journal | Journal de Physique I |

Volume | 7 |

Issue number | 8 |

State | Published - Dec 1 1997 |

### ASJC Scopus subject areas

- Statistical and Nonlinear Physics
- Engineering(all)

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## Cite this

*Journal de Physique I*,

*7*(8), 1111-1121.