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Metabasin dynamics of supercooled polymer melt |
| Jian Li(李健)1, Bo-Kai Zhang(张博凯)2 |
1 Department of Physics and Electronic Engineering, Heze University, Heze 274015, China;
2 Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, China |
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Abstract We employ molecular dynamic simulation to investigate metabasin dynamics for supercooled polymer melt. We find that, in a small system, the α-relaxation process is composed of a few crossing events that the monomers hops from one metabasin to another. Each crossing event is very rapid and involves a democratic movement of many particles, whereas such collective motion is not string-like. Evaluation on the contributions of metabasin exploration and democratic movement shows that the structural relaxation is mostly governed by the latter. Our calculated results show that the metabasin-metabasin transitions are not the main reason of spatially dynamical heterogeneity. It is different from the binary Lennard-Jones mixture model in which the metabasin-metabasin transitions are relevant for the spatially dynamical heterogeneity.
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Received: 28 August 2019
Revised: 13 October 2019
Accepted manuscript online:
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11804085) and the Doctoral Foundation of Heze University, China (Grant No. XY18BS13). |
Corresponding Authors:
Jian Li
E-mail: lijian2006400457@126.com
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Cite this article:
Jian Li(李健), Bo-Kai Zhang(张博凯) Metabasin dynamics of supercooled polymer melt 2019 Chin. Phys. B 28 126101
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