Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 117, Issue 8, Pages 4042-4046Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1493189
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We investigate the effect of polymer concentration on the diffusion and localization (entropic trapping) of linear polymer chains in a two-dimensional model system of small obstacles and large pores. Three distinct regimes are identified: the entropic trapping regime, a reptation regime where the larger pores are polymer saturated and the untrapped polymers reptate, and finally a crowding regime where intermolecular interactions dominate. In this model system, the entropic trapping, reptation, and crowding mechanisms compete and lead to a characteristic maximum in the diffusion coefficient for intermediate polymer concentrations. (C) 2002 American Institute of Physics.
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