| Issue |
Europhys. Lett.
Volume 66, Number 6, June 2004
|
|
|---|---|---|
| Page(s) | 874 - 880 | |
| Section | Interdisciplinary physics and related areas of science and technology | |
| DOI | https://doi.org/10.1209/epl/i2004-10040-x | |
| Published online | 01 June 2004 | |
Effective interactions between star polymers
John-von-Neumann Institute for Computing, Forschungszentrum Jülich D-52425 Jülich, Germany
Received:
11
March
2004
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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