Study on the microcosmic superlubricity mechanism of PVPA affected by metal cations

Hongyun CAI; Caixia ZHANG; Fuping LI; Mengmeng LIU; Tao ZHANG; Hongyan CHU; Zhifeng LIU

doi:10.1007/s40544-022-0632-7

Friction 2023, 11(7): 1150-1164 https://doi.org/10.1007/s40544-022-0632-7

Research Article |

Open Access | Issue | Published: 15 August 2022

Study on the microcosmic superlubricity mechanism of PVPA affected by metal cations

Show Author's Information Hide Author's Information Hongyun CAI^¹, Caixia ZHANG^{¹^,²}(

), Fuping LI^{¹^,²}, Mengmeng LIU^¹, Tao ZHANG^{¹^,²}, Hongyan CHU^{¹^,²}, Zhifeng LIU^{²^,³}(

)

1 Institute of Advanced Manufacturing and Intelligent Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

2 Machinery Industry Key Laboratory of Heavy Machine Tool Digital Design and Testing Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

3 Key Laboratory of CNC Equipment Reliability, Ministry of Education, School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China

Keywords:

superlubricity, adhesion, atomic force microscopy (AFM), molecular dynamics (MD) simulation, poly(vinylphosphonic acid) (PVPA), cation

Cite this article:

CAI H, ZHANG C, LI F, et al. Study on the microcosmic superlubricity mechanism of PVPA affected by metal cations. Friction, 2023, 11(7): 1150-1164. https://doi.org/10.1007/s40544-022-0632-7

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Abstract

Hydrophilic polymer coatings on artificial implants generate excellent tribological properties. The friction properties of polymer coatings are affected by salt ion factors. Herein, the atomic force microscopy (AFM) was used to show that the superlubricity was achieved between poly(vinylphosphonic acid) (PVPA)-modified Ti6Al4V and polystyrene (PS) microsphere probe lubricated with monovalent salt solutions (LiCl, NaCl, KCl, and CsCl). Considering that adhesion is an important cause of friction changes, the AFM was further utilized to obtain adhesion between friction pairs in different salt solutions. The results indicated that the larger the cation radius in the lubricant, the smaller the adhesion, and the lower the friction coefficient of the PVPA coating. The electrostatic interaction between the PVPA and one-valence cations in lubricants was analyzed by the molecular dynamics (MD) simulation as it was found to be the main influencing factor of the adhesion. Combined analysis results of friction and adhesion indicated that by adjusting the size of cation radius in lubricant, the adhesion between the tribo-pairs can be changed, and eventually the magnitude of friction can be affected. This study opens up a new avenue for analyzing the friction characteristics of hydrophilic polymer coatings from the perspective of intermolecular forces.

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About this article

Study on the microcosmic superlubricity mechanism of PVPA affected by metal cations

Show Author's information Hide Author's Information Hongyun CAI^¹, Caixia ZHANG^{¹^,²}(

), Fuping LI^{¹^,²}, Mengmeng LIU^¹, Tao ZHANG^{¹^,²}, Hongyan CHU^{¹^,²}, Zhifeng LIU^{²^,³}(

)

1 Institute of Advanced Manufacturing and Intelligent Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

2 Machinery Industry Key Laboratory of Heavy Machine Tool Digital Design and Testing Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

3 Key Laboratory of CNC Equipment Reliability, Ministry of Education, School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China

Abstract

Keywords: superlubricity, adhesion, atomic force microscopy (AFM), molecular dynamics (MD) simulation, poly(vinylphosphonic acid) (PVPA), cation

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Acknowledgements

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Publication history

Received: 29 March 2021

Revised: 13 July 2021

Accepted: 05 April 2022

Published: 15 August 2022

Issue date: July 2023

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51705010), the Beijing Natural Science Foundation (3192003), the General Project of Science and Technology Plan from Beijing Educational Committee (KM201810005013), the Tribology Science Fund of State Key Laboratory of Tribology (STLEKF16A02 and SKLTKF19B08), and the training program of Rixin talent and outstanding talent from Beijing University of Technology.

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