Reptational dynamics of a polymer chain is stable against kinematic disorder |
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Authors: | L Schäfer A Baumgärtner U Ebert |
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Institution: | Fachbereich Physik, Universit?t Essen, 45117, Essen, Germany Institut für Festk?rperforschung and Forum Modellierung, Forschungszentrum Jülich, 52425, Jülich, Germany Center voor Wiskunde en Informatica, Cluster MAS, 94079, 1090, Amsterdam, GB, The Netherlands
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Abstract: | We study the diffusive motion of a (non-selfinteracting) chain through a quenched random environment, constructed such that
it influences only the local dynamics but not the equilibrium configuration of the chain. Our Monte Carlo results show that
this type of disorder, which we call kinematic, does not ruin reptation. This is in sharp contrast to disorder including also
entropic traps and it supports the view that reptation prevails in melts, where in contrast to a gel entropic trapping is
absent. Our data show the characteristic features of reptation, irrespective of the dilution or randomness of the kinematic
obstacles. Our Monte Carlo results are in quantitative agreement with our recent detailed analytical evaluation of the reptation
model (J. Stat. Phys. 90, 1325 (1998)). The analysis suggests that we effectively see reptation of a “blob”-chain, where the size of the blob rapidly
increases with decreasing obstacle concentration.
Received 30 November 1998 and
Received in final form 18 December 1998 |
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Keywords: | PACS 83 20 Fk Reptation theories - 83 20 Jp Computer simulation - 83 10 Nn Polymer dynamics |
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