Synthesis and Performance Evaluation of Vinyl Acetate-Maleic Anhydride Based Polymeric Additives for Lubricating Oil

摘要

Copolymer of vinyl acetate with maleic anhydride was synthesised and the prepared copolymer was esterified with different long chain alcohols (octyl, decyl, and dodecyl alcohol). The performance of the polymeric additives in different base oils was evaluated as viscosity modifier (VM), also called viscosity index improver and pour point depressant by standard ASTM methods. Intrinsic viscosity and viscometric molecular weight of the polymers were determined by Huggins and Mark-Houwink equation, respectively. It was found that the efficiency of the polymers as a VM increases with increasing the alkyl chain length of the used alcohol. Whereas, the efficiency as a pour point depressant increases with decreasing alkyl chain length of the used alcohol of the polymers.