Preparation, Compatibility Studies and Evaluation of Polymer Mixture of Decyl Acrylate and its Copolymer with Styrene as Lubricating Oil Additives

摘要

Polydecyl acrylate (PDA) and copolymer of decyl acrylate (DA) with styrene and these polymeric samples were prepared, characterized and evaluated as additives for lubricating oil. Viscometric studies have been conducted on the binary solutions (polymer-solvent) of polydecyl acrylate (PDA), copolymer of DA as well as on their ternary solutions (polymer-polymer-solvent) having different concentrations of each polymer at 30°C in chloroform and toluene. The estimation of the compatibility degree of the above polymer pairs has been made by means of five criteria. Results show that in most of the cases polymer blends are compatible, except src=image/10.5923.j.ajps.20130303.01_001.gif> data. This is probably due to non-ideal behavior (hydrodynamic interaction) of polymers in ternary solutions. Data obtained in the solvents are not similar implying that polymer-polymer interactions and polymer-solvent interactions are both important for long chain polymers. Two solvents were chosen based on their ability to dissolve the polymers and, due to their differences in both structure and properties. The evaluation data indicates that compatible polymer mixtures act as much better viscosity index improvers (VII) and pour point depressants (PPD) than both the homopolymer and copolymer. With increasing concentration of the copolymer in the blend, there is gradual increase in the additive performance.