Volume 66, Number 6, June 2004
|Page(s)||874 - 880|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 June 2004|
Effective interactions between star polymers
John-von-Neumann Institute for Computing, Forschungszentrum Jülich D-52425 Jülich, Germany
Accepted: 21 April 2004
We study numerically the effective pair potential between two star polymers with equal arm lengths and equal number f of arms. The simulations were done for the soft-core Domb-Joyce model on the simple cubic lattice, to minimize corrections to scaling and to allow for an unlimited number of arms. For the sampling, we used the pruned-enriched Rosenbluth method (PERM). We find that the potential is much less soft than claimed in previous papers, in particular for . While we verify the logarithmic divergence of , with r being the distance between the two cores, predicted by Witten and Pincus, we find that the Mayer function for is hardly distinguishable from that for a Gaussian potential.
PACS: 82.35.Lr – Physical properties of polymers / 34.20.Gj – Intermolecular and atom-molecule potentials and forces / 44.05.+e – Analytical and numerical techniques
© EDP Sciences, 2004
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