2018 Impact factor 1.686
Soft Matter and Biological Physics

Eur. Phys. J. E 2, 311-318

Triplet interactions in star polymer solutions

C. von Ferber - A. Jusufi - C.N. Likos - H. Löwen - M. Watzlawek

Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany
ferber@thphy.uni-duesseldorf.de

Received 1 September 1999 and Received in final form 18 January 2000

Abstract
We analyze the effective triplet interactions between the centers of star polymers in a good solvent. Using an analytical short-distance expansion inspired by scaling theory, we deduce that the triplet part of the three-star force is attractive but only 11% of the pairwise part even for a close approach of three star polymers. We have also performed extensive computer simulations for different arm numbers f to extract the effective triplet force. The simulation data show good correspondence with the theoretical predictions. Our results justify the effective pair potential picture even beyond the star polymer overlap concentration.

PACS
82.70.Dd Colloids - 64.60.Fr Equilibrium properties near critical points, critical exponents - 61.20.Ja Computer simulation of liquid structure

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