Simultaneous production and functionalization of hexagonal boron nitride nanosheets by solvent-free mechanical exfoliation for superlubricant water-based lubricant additives

Lulu An, Yuanlie Yu, Changning Bai, Yongqing Bai, Bin Zhang, Kaixiong Gao, Xinbo Wang, Zhiping Lai, Junyan Zhang

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Abstract

Hexagonal boron nitride nanosheets (h-BNNSs), with a crystal lattice structure similar to graphene by over 98%, exhibit good lubrication properties as lubricant additives. However, the poor dispersibility in solvents has limited their wide practical applications as lubricant additives. In the present report, water dispersible Pebax functionalized h-BNNSs (Pebax-BNNSs) have been prepared through a one-step solvent-free mechanical exfoliation process which relies on a simple exfoliation of h-BN layers by shearing force in molten Pebax at 200 °C. In this process, Pebax molecules can synchronously react with the dangling bonds formed during the exfoliation process to achieve in situ functionalization of h-BNNSs. The reciprocating friction tests demonstrate that the as-obtained Pebax-BNNSs possess excellent antifriction and antiwear performance as water-based lubricant additive with a low concentration of 0.3 mg/mL under atmospheric condition. The friction coefficients can be
Original languageEnglish (US)
Journalnpj 2D Materials and Applications
Volume3
Issue number1
DOIs
StatePublished - Jul 26 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the Foundation of Lanzhou Institute of Chemical Physics, the National Natural Science Foundation of China (51875550, 51527901, and U1737213), the Youth Innovation Promotion Association (2017459), and the Science and Technology Program of Gansu Province (18JR3RA380).

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