Crossover time in relative fluctuations characterizes the longest relaxation time of entangled polymers
In entangled polymer systems, there are several characteristic time scales, such as the entanglement time and the disengagement time. In molecular simulations, the longest relaxation time (the disengagement time) can be determined by the mean square displacement (MSD) of a segment or by the shear re...
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| Veröffentlicht in: | The Journal of chemical physics 2012-09, Vol.137 (11), p.114903-114903 |
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| container_end_page | 114903 |
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| container_issue | 11 |
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| container_title | The Journal of chemical physics |
| container_volume | 137 |
| creator | Uneyama, Takashi Akimoto, Takuma Miyaguchi, Tomoshige |
| description | In entangled polymer systems, there are several characteristic time scales, such as the entanglement time and the disengagement time. In molecular simulations, the longest relaxation time (the disengagement time) can be determined by the mean square displacement (MSD) of a segment or by the shear relaxation modulus. Here, we propose the relative fluctuation analysis method, which is originally developed for characterizing large fluctuations, to determine the longest relaxation time from the center of mass trajectories of polymer chains (the time-averaged MSDs). Applying the method to simulation data of entangled polymers (by the slip-spring model and the simple reptation model), we provide a clear evidence that the longest relaxation time is estimated as the crossover time in the relative fluctuations. |
| doi_str_mv | 10.1063/1.4752768 |
| format | Article |
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| ispartof | The Journal of chemical physics, 2012-09, Vol.137 (11), p.114903-114903 |
| issn | 0021-9606 1089-7690 |
| language | eng |
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| source | MEDLINE; AIP Journals Complete; AIP Digital Archive; Alma/SFX Local Collection |
| subjects | Chain entanglement Crossovers Disengaging Fluctuation Molecular Dynamics Simulation Polymers Polymers - chemistry Relaxation time Reptation Segments Time Factors |
| title | Crossover time in relative fluctuations characterizes the longest relaxation time of entangled polymers |
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