Synthesis, Characterization, and Evaluation of 10-Undecenoic Acid-Based Epithio Derivatives as Multifunctional Additives
作者:Gorla Geethanjali、Korlipara V. Padmaja、Arukali Sammaiah、Rachapudi B. N. Prasad
DOI:10.1021/jf5033558
日期:2014.11.26
Novel epithio compounds from alkyl epoxy undecanoates (n-alkyl, C-1, C-4, and C-6; isoalkyl, C-3, C-4, and C-8) were synthesized using an ammonium thiocyanate in ionic liquid 1-methylimidazolium tetrafluoroborate/H2O (2:1) solvent system in 8590% yields by gas chromatographic (GC) analysis. The synthesized products were characterized by H-1 and C-13 nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy (FTIR), gas chromatography, and GC mass spectral (GC-MS) analyses and evaluated for their antioxidant, extreme pressure (EP), and antiwear (AW) properties in three different base oils, namely, epoxy jatropha fatty acid n-butyl esters (EJB), di-2-ethylhexyl sebacate (DOS), and mineral oil (S-105). Among the synthesized products, n-butyl epithio undecanoate exhibited superior antioxidant property (229.2 degrees C) compared to butylated hydroxytoluene (BHT, 193.8 degrees C) in base oil DOS and comparable performance in EJB and S-105 base oils. All of the epithio derivatives exhibited significantly enhanced weld point for the base oils EJB and DOS at 2 wt % level and displayed moderate enhancement in S-105 base oil. Methyl epithio undecanoate at 0.6% concentration exhibited considerable improvement in the wear scar of DOS base oil. The synthesized epithio derivatives have potential as multifunctional additives in lubricant formulations.