Effects of chain length on Rouse modes and non-Gaussianity in linear and ring polymer melts

The dynamics of ring polymer melts are studied via molecular simulations the Kremer–Grest bead-spring model. Rouse mode analysis is performed in comparison with linear polymers by changing chain length. Rouse-like behavior observed quantifying length dependence relaxation time, whereas a crossover from to reptation polymers. Furthermore, non-Gaussian parameters monomer bead displacement and center-of-mass analyzed. It found that non-Gaussianity remarkably suppressed slight growth for at long length, which contrast both dynamics.