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Updated: Sep 24, 2025

Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
Published on: September 5, 2018
Multifunctional lubricant additive based on difluoroboron derivatives of a diphenylamine antioxidant
Shengpei Wang1,2, Shasha Yu1, Jianxiang Feng1
1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences No. 1219, Zhongguan West Road Ningbo Zhejiang 315201 P. R. China rukawayss@hotmail.com sliu@nimte.ac.cn.
Abstract:
A metal-free and phosphorus-free novel multifunctional additive (E)-4-((3-(tert-butyl)-2-((difluoroboranyl)oxy)-5-((octylthio)methyl)benzylidene)amino)-N-phenylaniline (difluoroboron derivative 4a) was synthesized and characterized. The results show that its antioxidation and tribological properties are better than those of base oil, diphenylamine and zinc dialkyldithiophosphate (ZDDP), and it can also increase the extreme pressure performance of the base oil. In addition, it can be found that the diphenylamine functional group, boron and fluorine are the main contributors to the excellent antioxidation and antiwear properties of difluoroboron derivative 4a, respectively. Finally, the results of X-ray photoelectron spectroscopy on the worn surfaces reveal that B2O3, Fe2O3, a N-containing organic compound and iron fluoride comprise the boundary films, which effectively improve the difluoroboron derivative 4a's antiwear properties.
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