The Effect of Some Additives on the Rheological Properties of Engine Lubricating Oil (original) (raw)

The present work deals with the evaluation of some viscosity index improving additives. Three esters were prepared by esterification of acrylic acid with alcohols having different alkyl chain length. The structures of the prepared compounds were confirmed by Infra Red Spectroscopy. Three polymeric compounds were prepared by free radical polymerization of the different acrylates with vinyl acetate. The molecular weights of the prepared compounds were determined by Gel Permeation Chromatography. The prepared copolymers were evaluated as viscosity index improvers for lube oil and the rheological properties of lube oil were studied. It was found that the efficiency of the prepared additives as viscosity index improvers increases with increasing the molecular weight and concentration of the prepared copolymers and it was found that the apparent viscosity decreases with an increase in temperature.