Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (4): 20240037.doi: 10.7503/cjcu20240037

• Polymer Chemistry • Previous Articles    

Relaxation Dynamics of a Highly Stretched Single Polymer Chain in a Dilute Solution

YAO Ning1, WANG Haijun1,2,3(), LI Jiangtao1, GU Fang1, LIAO Qi4()   

  1. 1.College of Chemistry and Materials Science
    2.Chemical Biology Key Laboratory of Hebei Province
    3.Key Laboratory of Medicinal Chemistry and Molecular Diagnosis,Ministry of Education,Hebei University,Baoding 071002,China
    4.Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China
  • Received:2024-01-21 Online:2024-04-10 Published:2024-03-08
  • Contact: WANG Haijun, LIAO Qi E-mail:whj@hbu.edu.cn;qiliao@iccas.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(21973103);the Central Guidance on Local Science and Technology Development Fund of Hebei Province, China(236Z7601G);the Natural Science Foundation of Hebei Province, China(B2022201050);the Interdisciplinary Research Program of Natural Science of Hebei University, China(DXK202112)

Abstract:

For the relaxation of a highly stretched single polymer chain in dilute solutions of various solvent qualities, the relaxation dynamics was investigated through the methods of analytical theory and molecular dynamics(MD) simulation. To facilitate the comparison, the equilibrium and non-equilibrium routes were employed in the simulations, where the equilibrium route is performed by using the self-correlation function of related physical quantities. The reason for using the non-equilibrium route is that it is directly related to many practical processes, and the dynamic evolution of the scaling behavior between the relaxation time and normal modes can be present clearly. Consequently, it is found that at the initial stage of relaxation, some physical quantities would be influenced by the non-equilibrium initial state of the polymer chain, while after a certain time, the relaxation dynamics is consistent with that predicted the equilibrium state. Meanwhile, the two routes showed the same scaling behavior between the longest relaxation time and chain length. The non-equilibrium route is therefore helpful to investigate the whole relaxation process of a polymer chain, thereby giving more information of structure-property. It is expected that such an effort can provide some useful clues to pertinent topics.

Key words: Single polymer chain, Relaxation dynamics, Normal mode, Relaxation time

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