
In the present work, some polymeric additives were prepared via copolymerization of hexadecylacrylate and dodecylacrylate with styrene. Structure of the prepared compounds was confirmed by Fourier Transform Infrared Spectroscopy (F.T.I.R.), Proton Nuclear Magnetic Resonance (1H-NMR), and Gel Permeation Chromatography (GPC). The rheological properties of lube oil (SAE-30) with and without additives were studied at different temperatures (40oC, 60oC and 100oC) and it was found that they behave as Bingham fluids. The sensitivity of the prepared terpolymers to mechanical stresses was studied. It was found that the sensitivity increases with increasing the molecular weight of the prepared additives.