Friction between Strongly Compressed Polymer Brushes

Qi Liao

doi:10.1007/s10118-024-3151-3

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Friction between Strongly Compressed Polymer Brushes

RESEARCH ARTICLE | Updated：2024-08-27

- Friction between Strongly Compressed Polymer Brushes
- Chinese Journal of Polymer Science Vol. 42, Issue 9, Pages: 1368-1374(2024)
- Affiliations：
  
  Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Author bio：
  
  qiliao@iccas.ac.cn
- Funds：
- DOI：10.1007/s10118-024-3151-3
  CLC：
- Received：09 March 2024，
  
  Revised：2024-04-21，
  
  Accepted：28 April 2024，
  
  Online First：05 June 2024，
  
  Published：01 September 2024
- Accepted：
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Liao, Q. Friction between strongly compressed polymer brushes. Chinese J. Polym. Sci. 2024, 42, 1368–1374

Qi Liao. Friction between Strongly Compressed Polymer Brushes[J]. Chinese Journal of Polymer Science, 2024, 42(9): 1368-1374.
Liao, Q. Friction between strongly compressed polymer brushes. Chinese J. Polym. Sci. 2024, 42, 1368–1374 DOI： 10.1007/s10118-024-3151-3.

Qi Liao. Friction between Strongly Compressed Polymer Brushes[J]. Chinese Journal of Polymer Science, 2024, 42(9): 1368-1374. DOI： 10.1007/s10118-024-3151-3.

摘要

A maximum of friction coefficients is observed for polyelectrolyte brushes

which is in contrast to the neutral brushes with monotonical dependence.

Abstract

We present the results of molecular dynamics simulations of steady shear between a pair of neutral polymer brushes

as well as a pair of charged polymer brushes in the strongly compressed regime. The results of the molecular dynamic simulations of neutral and polyelectrolyte brushes in implicit solvent including normal forces

shear forces

viscosities and friction coefficients as a function of separation between brushes

are presented in the study. The comparison of the simulation results of neutral and charged brushes shows that the charged brushes is in the quasi-neutral regime

and the dependence of viscosity on the separation distance show the similar power law of neutral brushes. Our simulation results confirm that the implicit solvent simulations of polyelectrolyte brushes that ignore hydrodynamics interaction are in agreement with the scaling predictions qualitatively because of screening of hydrodynamic interaction and long-range electrostatic interactions on the correlation length scale. Both of neutral and charged brushes show the lubrication properties that the friction coefficient decreases with the separation decreases at enough large loads. However

a maximum of friction coefficients is observed for polyelectrolyte brushes

which is in contrast to the neutral brushes with monotonical dependence.

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references

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