In Situ‐Formed Ultralow Wear Tribofilms Induced by Poly(Acrylic Acid)‐co‐MXene‐Modified Polymer‐Like Carbon Films. Issue 7 (23rd March 2022)

• Record Type: Journal Article
• Authors: Yin, Xuan; Pang, Haosheng; Xu, Jianxun; Liu, Dameng; Chai, Chunpeng; Zhang, Bing
• Is Part Of: Advanced engineering materials. Volume 24:Issue 7(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-23
• Subjects: anionic polymers -- lubrication -- MXenes -- nanostructures -- tribofilms; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.202101661
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : Herein, two types of tribocouple pairs based on polymer‐like carbon (PLC) films are designed through the in situ‐formed MXene coating. The in situ‐formed MXene coatings are synthesized via the in situ organic–inorganic chemical composite technique‐induced anionic polymers with different molecular weights (≈450 000 and ≈4 000 000, respectively). Next, the tribotesting condition is controlled in the ambient environment under different loads by bare and PLC‐coated bearing steel balls as counterbodies. During the whole sliding process, a lubricity state (friction coefficient is about 0.21 and wear rate is about 1.5 × 10 −6 mm 3 N −1 m −1 ) is realized on the self‐mated PLC system. Meanwhile, the contact surfaces are covered by graphitic 2D Ti3 C2 . Compared with the high‐molecular‐weight modifier system, most poly(acrylic acid)‐ co ‐MXenes grafted by the low‐molecular‐weight poly(acrylic acid) form far more sp 2 ‐C phases. Moreover, active groups are potentially involved in forming a tribofilm, which enhances the overall lubricity of MXenes during sliding. This verifies the key to achieving low friction and ultralow wear based on the formation of the nanostructured sliding interface upon MXenes and provides an expanded application of solid lubricants. Abstract : Herein, two tribocouple pairs based on polymer‐like carbon (PLC) films cooperate with MXenes through in situ the organic–inorganic chemical composite technique‐induced PAA with different molecular weights. Most PAA‐ co ‐MXenes grafted by low‐molecular‐weight PAA form far more sp 2 ‐C phases of graphitic 2D Ti3 C2 . Active groups are potentially involved in forming a tribofilm to improve the lubricity of MXenes during sliding.