Triplet interactions in star polymer solutions |
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| Authors: | C von Ferber A Jusufi CN Likos H Löwen M Watzlawek |
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| Institution: | Institut für Theoretische Physik II, Heinrich-Heine-Universit?t Düsseldorf, D-40225 Düsseldorf, Germany, DE
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| 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.
Received 1 September 1999 and Received in final form 18 January 2000 |
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| Keywords: | 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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