Study of interaction between succinimides and bisphenols by PMR

Abstract

STUDIES of the compositions of detergent and anti-oxidizing additives confirm that in many cases a synergetic effect is observed on combining these additives which is particularly clear when determining the solubilizing action of additives [1-3]. An I R spectroscopic study of the interaction between suceinimides and bisphenols (and zinc dithiophosphates) indicates [4] that the interaction between the components of mixtures investigated is accompanied by the formation of hydrogen bonds which, apparently, results in a certain modification of the structure of associates (micelles) formed; this is, in all probability, the cause ()f synergism observed on combining these additives. The interaction between succinimides and bisphenols was studied by PMR. The presence of active proton-donor and proton-aeceptor ~ o u p s in the additives studied were a prerequisite for selecting this method. Proton magnetic resonance spectra were obtained using a JNM-C-60HLC high resolution PMR spectrometer and an operating frequency of 60 MHz. Chemical displacements in scale /i were measured in relation to hexamethyldisiloxane (internal standard). Chemically pure CC14 was used as solvent. The type of interaction between the additives examined can be evaluated from the variation of chemical shifts, line intensity and width and from the variation in the configuration of peaks in the spectra. Seven industrial suceinimide type additives were used in the form of 50% solutions in a paraffin-naphthene oil free from aromatics. The additives stu= died in order of increase of suceinimide molecular weight are as follows: