Physical Review E 74,5 (2006) 051107;
We explore the long-standing discrepancy between an experimentally observed sudden onset of the excluded-volume effect in stiff chains [Murakami , Macromolecules 13, 345 (1980)] and much more gradual onset seen by Monte Carlo simulations of the persistent self-avoiding walk model. We find by using various simulations and real-space renormalization methods that, while models incorporating parallel-bond inhibition enhance the excluded-volume effect, they have little effect on the abruptness of its onset. We also observe that relaxational simulations, which include reptationlike motion can, however, lead to a sudden onset much like in the experimental observation.
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