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Research Article | Open Access

Superlubricity by polyimide-induced alignment

Xinlei GAO1( ), Hao CHEN2, Hong YAN3, Chengrui HUANG2, Li WU4, Tingting WANG2
School of Materials Science and Engineering, Hubei University, Wuhan 430062, China
School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China
State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China
School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430074, China
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Graphical Abstract

Abstract

We have investigated the lubrication alignment behavior of point–plane contact and plane–plane contact between the GCr15 steel and polyimide (PI) friction pair using nematic liquid crystals (LCs) as the lubricant. In this system, rubbing orients the macromolecular PI molecules, and the oriented PI molecules induce alignment of the LC molecules in contact with or close to the oriented PI molecules. The LC molecules are aligned in the wear scar grooves of the PI film, and alignment extends to the GCr15-steel counterpart. Alignment of the LC molecules is correlated with the strong interaction force between the PI and LC molecules, the stable coordination structure of the LCs and GCr15 steel, and the weak interaction between the LC molecules. We performed simulations of the pretilt angle of PI and LCs and discussed the relationship between the pretilt angle and the friction properties. Owing to the small pretilt angle between PI and the LCs, the LC molecules orient almost parallel to the PI material, which is beneficial for superlubricity of this type of friction system.

Keywords

superlubricitypolyimidealignmentliquid crystal

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Friction
Volume 11 Issue 9,
September 2023
Pages 1690-1707
DOI: 10.1007/s40544-022-0686-6
Cite this article:
GAO X, CHEN H, YAN H, et al. Superlubricity by polyimide-induced alignment. Friction, 2023, 11(9): 1690-1707. https://doi.org/10.1007/s40544-022-0686-6

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Received: 11 April 2022
Revised: 10 June 2022
Accepted: 22 August 2022
Published: 10 March 2023
© The author(s) 2022.

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