| Issue |
Europhys. Lett.
Volume 68, Number 3, November 2004
|
|
|---|---|---|
| Page(s) | 384 - 390 | |
| Section | Atomic and molecular physics | |
| DOI | https://doi.org/10.1209/epl/i2003-10314-9 | |
| Published online | 16 October 2004 | |
Dynamics of a polymer in a quenched random medium: A Monte Carlo investigation
1
Max Planck Institute for Polymer Research Ackermannweg 10, 55128 Mainz, Germany
2
Institute for Physical Chemistry, Bulgarian Academy of Sciences 1113 Sofia, Bulgaria
Received:
11
December
2003
Accepted:
1
September
2004
We use an off-lattice bead-spring model of a self-avoiding polymer
chain immersed in a 3-dimensional quenched random medium to
study chain dynamics by means of a Monte Carlo (MC) simulation.
The chain center-of-mass mean-squared displacement as a function
of time reveals two crossovers which depend both on chain length
N and on the degree of Gaussian disorder Δ. The first
one from normal to anomalous diffusion regime is found at short
time 
and observed to vanish rapidly as
with growing disorder. The second
crossover back-to-normal diffusion, 
, scales as
with f being some
scaling function. The diffusion coefficient DN depends
strongly on disorder and drops dramatically at a critical
dispersion 
of the disorder
potential so that for 
the chain center of
mass is practically frozen. These findings agree well with our
recent theoretical predictions.
PACS: 36.20.-r – Macromolecules and polymer molecules / 71.55.Jv – Disordered structures; amorphous and glassy solids / 07.05.Tp – Computer modeling and simulation
© EDP Sciences, 2004
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