Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/70550
Title: Repetition and pair-interaction of string-like hopping motions in glassy polymers
Authors: Lam, CH 
Issue Date: 2017
Source: Journal of chemical physics, 2017, v. 146, no. 24, 244906, p. 244906-1-244906-9
Abstract: The dynamics of many glassy systems are known to exhibit string-like hopping motions each consisting of a line of particles displacing one another. By using the molecular dynamics simulations of glassy polymers, we show that these motions become highly repetitive back-and-forth motions as temperature decreases and do not necessarily contribute to net displacements. Particle hops which constitute string-like motions are reversed with a high probability, reaching 73% and beyond at low temperature. The structural relaxation rate is then dictated not by a simple particle hopping rate but instead by the rate at which particles break away from hopping repetitions. We propose that disruption of string repetitions and hence also structural relaxations are brought about by pair-interactions between strings. Published by AIP Publishing.
Publisher: American Institute of Physics
Journal: Journal of chemical physics 
ISSN: 0021-9606
EISSN: 1089-7690
DOI: 10.1063/1.4990417
Rights: © 2017 Author(s).
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in C. H. Lam, J. Chem. Phys. 146, 244906 (2017) and may be found at https://dx.doi.org/10.1063/1.4990417
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