Photorheological fluids of azobenzene polymers for lubrication regulation

Shuangxi TANG; Shayu LI; Liran MA; Yu TIAN

doi:10.1007/s40544-021-0529-x

Friction 2022, 10(7): 1078-1090 https://doi.org/10.1007/s40544-021-0529-x

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Open Access | Issue | Published: 15 December 2021

Photorheological fluids of azobenzene polymers for lubrication regulation

Show Author's Information Hide Author's Information Shuangxi TANG^¹, Shayu LI^², Liran MA^¹(

), Yu TIAN^¹(

)

1State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

2College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China

Keywords:

lubrication, viscosity, photorheological fluids, azobenzene polymer

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TANG S, LI S, MA L, et al. Photorheological fluids of azobenzene polymers for lubrication regulation. Friction, 2022, 10(7): 1078-1090. https://doi.org/10.1007/s40544-021-0529-x

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Abstract

Fluid viscosity is ubiquitous property and is of practical importance in intelligent fluids, industrial lubrication, and pipeline fluid transportation. Recently, there has been a surging interest in viscosity regulation. Here, we have developed a group of photorheological fluids by utilizing azobenzene polymers with a light-induced microstructure transformation. In this work, a photosensitive polymer with 4,4'-bis-hydroxyazobenzene as the main chain was designed and synthesized as a pivotal functional material. The sufficiently large structural difference under ultraviolet and near-infrared light makes it possible to regulate the viscosity of a polyethylene glycol solution. The viscosity of the photosensitive rheological fluids under ultraviolet light radiation is found to be up to 45.1% higher than that under near-infrared light radiation. To explore this intelligent lubricating technology, the friction regulation of ceramic sliding bearings was investigated utilizing photosensitive rheological fluids. Reversible friction regulation with a ratio of up to 3.77 has been achieved by the alternative irradiation of near-infrared and ultraviolet light, which can be attributed to the differences in mechanical properties and molecular structures under ultraviolet and near-infrared light according to both simulations and experiments. Such photorheological fluids will have promising applications in controllable lubrication, intelligent rheological fluids, and photosensitive dampers.

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About this article

Photorheological fluids of azobenzene polymers for lubrication regulation

Show Author's information Hide Author's Information Shuangxi TANG^¹, Shayu LI^², Liran MA^¹(

), Yu TIAN^¹(

)

1State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

2College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China

Abstract

Keywords: lubrication, viscosity, photorheological fluids, azobenzene polymer

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Publication history

Received: 12 March 2021

Revised: 18 May 2021

Accepted: 21 May 2021

Published: 15 December 2021

Issue date: July 2022

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 51922058 and 51527901). We thank professor Shayu Li for the generous help on azobenzene polymer synthesis.

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