Non-gaussian effects in the cage dynamics of polymers
| Autor: | Ottochian, A., De Michele, C., Leporini, D. |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Ottochian, A., De Michele, C. and Leporini, D.(2008)'Non-Gaussian effects in the cage dynamics of polymers', Philosophical Magazine, 88:33, 4057--4062 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1080/14786430802348060 |
| Popis: | 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. Comment: 8 pages, 5 figures |
| Databáze: | arXiv |
| Externí odkaz: |
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