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No Access Submitted: 11 April 2017 Accepted: 14 June 2017 Published Online: 29 June 2017

  • Repetition and pair-interaction of string-like hopping motions in glassy polymers

J. Chem. Phys. 146, 244906 (2017); https://doi.org/10.1063/1.4990417
Chi-Hang Lama)
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  • Chi-Hang Lam
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.

ACKNOWLEDGMENTS

We thank D. A. Weitz for suggesting the use of a quasi-particle view of void. We also thank O. K. C. Tsui and M. Isobe for many helpful discussions. We are grateful for the support of Hong Kong GRF (Grant No. 15301014).

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  1. © 2017 Author(s). Published by AIP Publishing.

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