Volume 82, Number 4, May 2008
Article Number 46003
Number of page(s) 4
Section Condensed Matter: Structural, Mechanical and Thermal Properties
Published online 13 May 2008
EPL, 82 (2008) 46003
DOI: 10.1209/0295-5075/82/46003

The confinement free energies of non-ideal branched polymers and ideal unbranched polymers are the same

R. Ghafouri, J. Rudnick and R. Bruinsma

Department of Physics and Astronomy, University of California, Los Angeles Los Angeles, CA 90095-1547, USA

received 23 December 2007; accepted in final form 26 March 2008; published May 2008
published online 13 May 2008

We use the method of dimensional reduction to show that a branching polymer with excluded-volume interaction confined between two flat plates has, in the thermodynamic limit, a confinement free energy and density profile that is the same as that of an ideal linear polymer with the same number of monomers and the same monomer-plate interaction potential. Condensation due to branching is exactly compensated by swelling due to excluded-volume interaction.

61.25.H- - Macromolecular and polymers solutions; polymer melts.
82.39.Pj - Nucleic acids, DNA and RNA bases.

© EPLA 2008