Effects of chain length on Rouse modes and non-Gaussianity in linear and ring polymer melts
Abstract
The dynamics of ring polymer melts are studied via molecular dynamics simulations of the Kremer-Grest bead-spring model. Rouse mode analysis is performed in comparison with linear polymers by changing the chain length. Rouse-like behavior is observed in ring polymers by quantifying the chain length dependence of the Rouse relaxation time, whereas a crossover from Rouse to reptation behavior is observed in linear polymers. Furthermore, the non-Gaussian parameters of the monomer bead displacement and chain center-of-mass displacement are analyzed. It is found that the non-Gaussianity of ring polymers is remarkably suppressed with slight growth for the center-of-mass dynamics at long chain length, which is in contrast to the growth in linear polymers both for the monomer bead and center-of-mass dynamics.
Keywords
Cite
@article{arxiv.2106.13467,
title = {Effects of chain length on Rouse modes and non-Gaussianity in linear and ring polymer melts},
author = {Shota Goto and Kang Kim and Nobuyuki Matubayasi},
journal= {arXiv preprint arXiv:2106.13467},
year = {2021}
}
Comments
9 pages, 4 figures, to appear in J. Chem. Phys