Local Transient Jamming in Stress Relaxation of Bulk Amorphous Polymers

Ji-Ping Wang; Yi-Huan Yu; Ya-Qian Guo; Wen Luo; Wen-Bing Hu

doi:10.1007/s10118-021-2570-7

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Local Transient Jamming in Stress Relaxation of Bulk Amorphous Polymers

ARTICLE | Updated：2021-04-29

- Local Transient Jamming in Stress Relaxation of Bulk Amorphous Polymers
- Chinese Journal of Polymer Science Vol. 39, Issue 7, Pages: 906-913(2021)
- Affiliations：
  
  Department of Polymer Science and Engineering, State Key Lab of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
- Author bio：
  
  wbhu@nju.edu.cn
- Funds：
- DOI：10.1007/s10118-021-2570-7
  CLC：
- Received：27 January 2021，
  
  Revised：2021-2-13，
  
  Accepted：22 February 2021，
  
  Online First：29 April 2021，
  
  Published：14 May 2021
- Accepted：
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Wang, J. P.; Yu, Y. H.; Guo, Y. Q.; Luo, W.; Hu, W. B. Local transient jamming in stress relaxation of bulk amorphous polymers. Chinese J. Polym. Sci. 2021, 39, 906–913

Ji-Ping Wang, Yi-Huan Yu, Ya-Qian Guo, et al. Local Transient Jamming in Stress Relaxation of Bulk Amorphous Polymers[J]. Chinese Journal of Polymer Science, 2021, 39(7): 906-913.
Wang, J. P.; Yu, Y. H.; Guo, Y. Q.; Luo, W.; Hu, W. B. Local transient jamming in stress relaxation of bulk amorphous polymers. Chinese J. Polym. Sci. 2021, 39, 906–913 DOI： 10.1007/s10118-021-2570-7.

Ji-Ping Wang, Yi-Huan Yu, Ya-Qian Guo, et al. Local Transient Jamming in Stress Relaxation of Bulk Amorphous Polymers[J]. Chinese Journal of Polymer Science, 2021, 39(7): 906-913. DOI： 10.1007/s10118-021-2570-7.

摘要

Abstract

Bulk amorphous polymers become stretched and parallel-aligned under loading stress

and their intermolecular cooperation slows down the subsequent stress relaxation process. By means of dynamic Monte Carlo simulations

we employed the linear viscoelastic Maxwell model for stress relaxation of single polymers and investigated their intermolecular cooperation in the stress relaxation process of stretched and parallel-aligned bulk amorphous polymers. We carried out thermal fluctuation analysis on the reproduced Debye relaxation and Arrhenius fluid behaviors of bulk polymers. We found a transient state with stretch-coil coexistence among polymers in the stress relaxation process. Further structure analysis revealed a scenario of local jamming at the transient state

resulting in an entropy barrier for stretch-coil transition of partial polymers. The microscopic mechanism of intermolecular cooperation appears as unique to polymer stress relaxation

which interprets the hydrodynamic interactions as one of essential factors raising a high viscosity in bulk amorphous polymers. Our simulations set up a platform of molecular modeling in the study of polymer stress relaxation

which brought new insights into polymer dynamics and the related mechanical/rheological properties.

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