Abstract
This work aims to prepare and characterize dialkyl maleate via esterification of maleic anhydride with different alcohols (butanol, octanol, decyl alcohol, and dodecyl alcohol) to produce dibutyl maleate M1, dioctyl maleate M2, didecyl maleate M3, and didodecyl maleate M4. Then polymerization of the prepared dialkyl maleate with two different monomers (vinyl acetate and styrene) to produce dialkyl maleate-vinyl acetate copolymers (M1v, M2v, M3v, and M4v) and dialkyl maleate-styrene copolymers(M1S, M2S, M3S, and M4S). The molecular weight of the prepared copolymers were determined by using Gel Permeation chromatography (GPC) water 600E. The efficiency of the prepared copolymers for improving the viscosity index of the base lube oil was studied. It was found that the efficiency increases with increasing alkyl chain length of alcohol group in the prepared dialkyl maleat and increases with increasing the molecular weight of the prepared copolymers, and the efficiency of the prepared copolymers as viscosity index improvers for the lube oil increases with increasing the concentration of this compound in solution (base oil). It was also found that VI increases in presence of styrene monomer than that of vinyl acetate monomer.
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