Journal
REACTIVE & FUNCTIONAL POLYMERS
Volume 193, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.reactfunctpolym.2023.105744
Keywords
Polyimide; Wear-resistant; Lubrication; Tribo-chemistry mechanism
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Ti3C2Tx MXene can improve the wear resistance of polyimide (PI) matrix under complex working conditions. The Ti3C2Tx/PI composites have excellent frictional properties and form a transfer film during friction, which prevents further wear of the material. Therefore, two-dimensional MXene has the potential to be used in friction-protective layers.
Ti3C2Tx MXene was cooperated with polyimide (PI) to improve the wear resistance of the PI matrix under complex working conditions. Compared to the pristine PI, the Ti3C2Tx/PI composites have excellent frictional properties, specifically, the coefficient of friction is 0.32 and the wear rate is 0.62 x 10-5 mm3/(N & sdot;m). The composites formed a transfer film on the contact surface during the friction process, and the transfer film prevents direct contact between tribo-couples. The results studied by Raman and XPS showed that the transfer film contains TiO2 that is derived from oxidized Ti3C2Tx. Moreover, the tribological mechanism has been summarized as two aspects: On one hand, the relative sliding of the Ti3C2Tx lamellae transfers the sliding stress. On the other hand, a transfer film is created between Ti3C2Tx/PI composites and steel ball during friction that prevents further wear of the material. All in all, two-dimensional MXene can effectively improve the wear resistance of the polymer matrix and has the potential to be used in friction-protective layers under complex working conditions.
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