Castor Oil and Acrylate based Copolymer as Green Additive for Lubricating Oil
In this work, the authors synthesized three different acrylates by esterification reaction of acrylic acid with three different long chain alcohols (octan -1-ol, decan -1-ol and dodecan -1-ol). Homopolymer of castor oil (CO) and three copolymers of castor oil with acrylates were prepared by free radical polymerization method in the presence of azobisisobutyronitrile (AIBN) as initiator. FT-IR and NMR spectral technique were used to characterize the synthesized polymers. The number average molecular weight (Mn) and weight average molecular weight (Mw) were measured by gel permeation chromatography (GPC) method. Thermo gravimetric analysis (TGA) method was used to study the thermal behaviour of the prepared polymers at high temperature. Performances of the polymers as additives in lubricating oil were carefully assessed in terms of viscosity index and pour point. The experimental results showed that the prepared copolymers are better additives than homopolymer. Disc diffusion method was applied to carry out the biodegradability test of all the prepared polymers.
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