Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-10-04
Europhys. Lett. 92, 28003 (2010)
Physics
Condensed Matter
Soft Condensed Matter
6 pages, 5 figures, to be published in Europhys. Lett. (2010)
Scientific paper
10.1209/0295-5075/92/28003
When the local intrinsic stiffness of a polymer chain varies over a wide range, one can observe both a crossover from rigid-rod-like behavior to (almost) Gaussian random coils and a further crossover towards self-avoiding walks in good solvents. Using the pruned-enriched Rosenbluth method (PERM) to study self-avoiding walks of up to $N_b=50000$ steps and variable flexibility, the applicability of the Kratky-Porod model is tested. Evidence for non-exponential decay of the bond-orientational correlations $<\cos \theta (s) >$ for large distances $s$ along the chain contour is presented, irrespective of chain stiffness. For bottle-brush polymers on the other hand, where experimentally stiffness is varied via the length of side-chains, it is shown that these cylindrical brushes (with flexible backbones) are not described by the Kratky-Porod wormlike chain model, since their persistence length is (roughly) proportional to their cross-sectional radius, for all conditions of practical interest.
Binder Kurt
Hsu Hsiao-Ping
Paul Wolfgang
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