Physics – Fluid Dynamics
Scientific paper
2009-08-28
Ottochian, A., De Michele, C. and Leporini, D.(2008)'Non-Gaussian effects in the cage dynamics of polymers', Philosophical Mag
Physics
Fluid Dynamics
8 pages, 5 figures
Scientific paper
10.1080/14786430802348060
The correlation between the fast cage dynamics and structural relaxation is investigated in a model polymer system. It is shown that the cage vibration amplitude, as expressed by the Debye-Waller factor, and the relaxation time $\tau_\alpha$ collapse on a single universal curve with a simple analytic form when the temperature, the density, the chain length and the monomer-monomer interaction potential are changed. For the physical states with the same $\tau_\alpha$ coincidence of the mean-square displacement, the intermediate scattering function and the non-Gaussian parameter is observed in a wide time window spanning from the ballistic regime to the onset of the Rouse dynamics driven by the chain connectivity. The role of the non-Gaussian effects is discussed.
Leporini Dino
Michele Carlo de
Ottochian Alistar
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