Nehal S. Ahmed*, Amal M. Nassar and Abdel – Azim A. Abdel – Azim.
Department of Petroleum Applications, Egyptian Petroleum Research Institute,
Nasr City, Cairo, Egypt.
Four esters were prepared by esterification of acrylic acid with alcohols having different
alkyl chain length. The structures of the prepared compounds were confirmed by I.R.
spectroscopy and molecular weight determination. Eight polymeric compounds were
prepared by free radical polymerization of different acrylate esters with maleic anhydride
and vinyl acetate. The molecular weights of the prepared compounds were determined by
GPC. The solibility of all prepared copolymers in lube oil was established. The prepared
copolymers were evaluated as viscosity index improvers (VI) and pour point depressants
for lube oil. It was found that the polymers were prepared from vinyl acetate monomer
are more efficient, as viscosity index improvers, than those prepared from maleic
anhydride. The VI increases with decreasing the side chain length of alcohol. On the
other hand the efficiency of the prepared copolymers, as viscosity index improvers
increases with increasing the concentration of the additives in the solution. The efficiency
of the prepared copolymers as pour point depressants increases with decreasing the
concentration of the additives and increasing the chain length of alkyl groups. The
prepared polymeric compounds from maleic anhydride with different alcohols are more
efficient as pour point depressant, than those prepared from vinyl acetate monomer.