Drift of a polymer chain in a porous medium --A Monte Carlo study |
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Authors: | K Avramova A Milchev |
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Institution: | (1) Institute for Physical Chemistry, Bulgarian Academy of Sciences, G. Bonchev Str., Block 11, 1113 Sofia, Bulgaria, BG |
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Abstract: | We investigate the drift of an end-labeled telehelic polymer chain in a frozen disordered medium under the action of a constant
force applied to the one end of the macromolecule by means of an off-lattice bead spring Monte Carlo model. The length of
the polymers N is varied in the range 8 < N < 128, and the obstacle concentration in the medium C is varied from zero up to the percolation threshold C≈ 0.75. For field intensities below a C-dependent critical field strength B
c, where jamming effects become dominant, we find that the conformational properties of the drifting chains can be interpreted
as described by a scaling theory based on Pincus blobs. The variation of drag velocity with C in this interval of field intensities is qualitatively described by the law of Mackie-Meares. The threshold field intensity
B
c itself is found to decrease linearly with C.
Received 20 August 2001 and Received in final form 19 November 2001 |
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Keywords: | PACS 36 20 -r Macromolecules and polymer molecules – 36 20 Ey Conformation (statistics and dynamics) – 82 45 -h Electrochemistry and electrophoresis |
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