Preparation and evaluation of some newly liquid crystal as antioxidant for base stocks

Ashmawy, Ashraf M; Nessim, Maher I; Osman, Doaa I; Elnaggar, El Sayed M

doi:10.30473/icc.2018.4825

Document Type : Original Research Article

Authors

¹ Chemistry Department, Faculty of Science (boys), AL-Azhar University, 11884, (EGYPT).

² Egyptian Petroleum Research Institute, Evaluation and Analysis Department.

https://doi.org/10.30473/icc.2018.4825

Abstract

Four liquid crystal compounds of the form, 2-Sec-butyl-4-[(4-x-phenyl) diazenyl) phenyl-4-(octadecyloxy] benzoate symbolized as I18a, I18b, I18c and I18d were prepared in which the substituent (X) was taken CH3O-, CH3-, Br- and -NO2 respectively. Characterization of prepared compounds is done using FT-IR, 1H-NMR, Mass Spectroscopy and Elemental Analysis.. Their mesophase behavior was investigated by Differential Scanning Calorimetry (DSC). Their antioxidant efficiency for Egyptian lubricating base oil was tested. The oxidation processes was monitored using the change in the Total Acid Number (TAN). The obtained results showed that, the efficiency of these compounds was ranked as follows I18d > I18c > I18b > I18a.

Graphical Abstract

Keywords

Main Subjects

Physical chemistry

References

[1] M.D. Johnson, S. Korcek, M. Zinbo, Industrial & engineering chemistry research, 26, 1987, 1754-1757.

[2] S.K. Naidu, E.E. Klaus, J.L. Duda, Industrial & engineering chemistry product research and development, 23, 1984, 613-619.

[3] F. Egharevba, A.U. Maduako, Industrial & engineering chemistry research, 41, 2002, 3473-3481.

[4] E. Abner Jr, Lubricant deterioration in service, CRC Handbook of Lubrication, Citeseer, 1983, pp. 517-532.

[5] G. Offunne, A. Maduako, C. Ojinnaka, Tribology International, 22, 1989, 401-404.

[6] G. Ofunne, A. Maduako, C. Ojinnaka, Tribology International, 23, 1990, 407-412.

[7] E. Klaus, L. Cho, H. Dang, SAE Technical Paper, 1980.

[8] F.J. Carrion, G. Martinez-Nicolas, P. Iglesias, J. Sanes, M.D. Bermudez, Int J Mol Sci, 10, 2009, 4102-4115.

[9] M.D. Bermúdez, W. Brostow, F.J. Carrión-Vilches, J.J. Cervantes, D. Pietkiewicz, Polymer, 46, 2005, 347-362.

[10] T. Hirose, H. Takai, M. Watabe, H. Minamikawa, T. Tachikawa, K. Kodama, M. Yasutake, Tetrahedron, 70, 2014, 5100-5108.

[11] R.I. Nessim, M.M. Naoum, S.Z. Mohamed, M.I. Nessim, Liquid Crystals, 31, 2004, 649-654.

[12] G. Biresaw, D. Zadnik, Tribology and the Liquid-Crystalline State, 1989, 83-90.

[13] M.-D. Bermúdez, G. Martínez-Nicolás, F.-J. Carrión-Vilches, Wear, 212, 1997, 188-194.

[14] S. Mori, H. Iwata, Tribology international, 29, 1996, 35-39.

[15] Y. Kimura, K. Nakano, T. Kato, S. Morishita, Wear, 175, 1994, 143-149.

[16] M. Shen, J. Luo, S. Wen, J. Yao, Tribology & Lubrication Technology, 58, 2002, 18.

[17] K. Nakano, Tribology Letters, 14, 2003, 17-24.

[18] P. Iglesias, M. Bermudez, F. Carrion, G. Martınez-Nicolás, Wear, 256, 2004, 386-392.

[19] M.M. Naoum, G.R. Saad, R.I. Nessim, T.A. Abdel-Aziz, H. Seliger, Liquid crystals, 23, 1997, 789-795.

[20] M.I. Nessim, A.A. Bassoussi, D.I. Osman, H.F.Khalil, A.M.Ashmawy, International Journal of Current Research, 6, 2014, 9203-9216.

[21] S.Z. Mohammady, R.I. Nessim, O.R. Shehab, M.M. Naoum, Liquid Crystals, 32, 2005, 477-482.

[22] H. Omrani, A.E. Dudelzak, B.P. Hollebone, H.-P. Loock, Analytica chimica acta, 811, 2014, 1-12.

[23] M. Rashed, M. Kalam, H. Masjuki, H. Rashedul, A. Ashraful, I. Shancita, A. Ruhul, RSC Advances, 5, 2015, 36240-36261.

Iranian chemical communication

Preparation and evaluation of some newly liquid crystal as antioxidant for base stocks

References

References

Volume 7, Issue 3, pp. 160-229, Serial No. 24
July 2019
Pages 196-205

Preparation and evaluation of some newly liquid crystal as antioxidant for base stocks

References

References

Volume 7, Issue 3, pp. 160-229, Serial No. 24July 2019Pages 196-205

Volume 7, Issue 3, pp. 160-229, Serial No. 24
July 2019
Pages 196-205