CHARACTERIZATION OF NITROGEN AND PHOSPHORUS COMPONENTS IN A MULTIFUNCTIONAL LUBRICANT ADDITIVE BY NMR AND IR TECHNIQUES

This paper highlights the application of P-31, H-1, C-13-NMR and FT-IR techniques for the compositional analysis of a commercial nitrogen an d phosphorus-containing ashless multifunctional additive. The assignme nt of signals in the P-31, H-1, C-13-NMR and IR spectra of the sample facilitated the identification of different phosphorus-containing spec ies, i.e., trialkyl phosphate, alkyl amine salt of mono/dialkyl phosph oric acid and polyalkyl phosphate. The alkyl group in all the phosphor ous-containing components has been found to be 2-ethyl hexyl by the C- 13-NMR spectral analysis. Further, these components have been separate d by column chromatography and their chemical structures have been con firmed by the above spectroscopic techniques.