A sulfonated modification of PEEK for ultralow friction

Shihua YUAN; Chenhui ZHANG

doi:10.1007/s40544-022-0625-6

Friction 2023, 11(6): 881-893 https://doi.org/10.1007/s40544-022-0625-6

Research Article |

Open Access | Issue | Published: 30 July 2022

A sulfonated modification of PEEK for ultralow friction

Show Author's Information Hide Author's Information Shihua YUAN, Chenhui ZHANG(

)

State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

Keywords:

friction, wear, hydration lubrication, polyether ether ketone (PEEK), sulfonation

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YUAN S, ZHANG C. A sulfonated modification of PEEK for ultralow friction. Friction, 2023, 11(6): 881-893. https://doi.org/10.1007/s40544-022-0625-6

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Abstract

Polyether ether ketone (PEEK) is a widely used material for friction pairs due to its excellent mechanical strength, good wear resistance, and chemical inertness. However, some modifications are necessary when PEEK is used as a water-lubricated friction pair. In this study, a novel sulfonation method was developed to design a water-lubricated friction pair with ultralow friction, good wear resistance, and high loading capacity. PEEK powders were sulfonated using ClSO₃H and sintered to form bulk plastic. The sulfonated PEEK (SPEEK) plastic exhibited good tribological properties. At a low sliding speed, the friction coefficient was smaller than 0.02 when a 3 wt% NaCl solution was used as the lubricant. The order of magnitude of the wear rate was as low as 10^-8 mm³/(N⋅m). The mechanism of friction reduction was mainly hydration lubrication. The negatively charged –SO₃^– groups on the friction pair can adsorb hydrated Na⁺ cations by electrostatic interactions. These hydrated Na⁺ cations have a high load capacity and low shearing resistance. The ultralow wear mechanism observed in this study is possibly due to ultralow friction properties of the friction pairs prepared through the proposed sulfonation and thermoforming procedures.

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About this article

A sulfonated modification of PEEK for ultralow friction

Show Author's information Hide Author's Information Shihua YUAN, Chenhui ZHANG(

)

State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

Abstract

Keywords: friction, wear, hydration lubrication, polyether ether ketone (PEEK), sulfonation

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Publication history

Received: 21 December 2021

Revised: 22 February 2022

Accepted: 15 March 2022

Published: 30 July 2022

Issue date: June 2023

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Grant No. 51925506).

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