The effect of molecular structure of heterocyclic compounds containing N, O and S on their tribological performance

The effect of molecular structure of heterocyclic compounds containing N, O and S on their... The friction and wear performance of heterocyclic compounds (2-mercaptobenzoxazole, 2-mercaptobenzothiazole and 2-mercaptobenzimidazole), which have the same cyclic structure except for the one-location atom difference, added to liquid paraffin and synthesized diester were evaluated using a four-ball machine. The results show that there is a ranking of the antiwear performance: 2-mercaptobenzoxazole>2-mercaptobenzothiazole>2-mercaptobenzimidazole, but, there is another ranking of the load-carrying capacity: 2-mercaptobenzothiazole>2-mercaptobenzoxazole>2-mercaptobenzimidazole. X-ray photoelectron spectroscopy (XPS) was used to examine the binding energy of elements on the rubbed surface in order to determine whether the cyclic compounds remain intact or decompose after rubbing. Finally, the effect of S, N and O elements in the compounds on antiwear properties is discussed according the theory of molecular orbits and electron effect. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Wear Elsevier

The effect of molecular structure of heterocyclic compounds containing N, O and S on their tribological performance

Wear, Volume 231 (1) – Jun 1, 1999

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Publisher
Elsevier
Copyright
Copyright © 1999 Elsevier Science S.A.
ISSN
0043-1648
eISSN
1873-2577
DOI
10.1016/S0043-1648(99)00111-8
Publisher site
See Article on Publisher Site

Abstract

The friction and wear performance of heterocyclic compounds (2-mercaptobenzoxazole, 2-mercaptobenzothiazole and 2-mercaptobenzimidazole), which have the same cyclic structure except for the one-location atom difference, added to liquid paraffin and synthesized diester were evaluated using a four-ball machine. The results show that there is a ranking of the antiwear performance: 2-mercaptobenzoxazole>2-mercaptobenzothiazole>2-mercaptobenzimidazole, but, there is another ranking of the load-carrying capacity: 2-mercaptobenzothiazole>2-mercaptobenzoxazole>2-mercaptobenzimidazole. X-ray photoelectron spectroscopy (XPS) was used to examine the binding energy of elements on the rubbed surface in order to determine whether the cyclic compounds remain intact or decompose after rubbing. Finally, the effect of S, N and O elements in the compounds on antiwear properties is discussed according the theory of molecular orbits and electron effect.

Journal

WearElsevier

Published: Jun 1, 1999

References

  • Antiwear and extreme pressure characteristics of 2-mercaptobenzothiazole derivative as the potential lubricating oil additive
    Wan, Y.; Pu, Q.; Xue, Q.; Su, Z.
  • Tribological performance and action mechanism of certain S, N heterocyclic compounds as potential lubricating oil additives
    Wan, Y.; Yao, W.; Ye, X.; Cao, L.; Shen, G.; Yue, Q.

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