Use of copolymers of decyl methacrylate and styrene as V. I. improvers in oils

Akhmedov, A. I.; Levshina, A. M.

doi:10.1007/bf00730994

Cited by 1 publication

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“…Commonly used comonomers of such type are maleic anhydride, maleic acid esters, maleimides, N-vinyl pyrrolidone, N-vinyl imidazole, and styrene and its derivatives. [1][2][3][4] From the earlier studies on styrene-based methacrylate additives (mostly copolymers of butyl or decyl methacrylate), particularly those conducted by Akhmedov et al, [4,5], it was shown that these additives possess higher thermal stability and improved shear stability in comparison with poly(alkyl methacrylates). These improvements are facilitated by increasing the styrene content, but application of copolymers containing a high styrene content is limited by their relatively low solubility in mineral oils.…”

Section: Introductionmentioning

confidence: 99%

Alkyl methacrylate and styrene terpolymers as lubricating oil viscosity index improvers

Jukić

Vidović

Janović

2007

Chem Technol Fuels Oils

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The properties of styrene/dodecyl methacrylate/octadecyl methacrylate terpolymers as viscosity index improvers of lubricating mineral oils were investigated. Terpolymers of different composition and molar mass were prepared by peroxide-initiated polymerization of the monomer mixture in a mineral base oil solution. All the terpolymer solutions in base oil exhibited high kinematic viscosity and viscosity index values (> 130), proving their high thickening efficiency. The ratio of viscosity values at 100°C and 40°C of styrene/alkyl methacrylate additive solutions was between 0.95 and 1.0, showing the coherent thickening effect in a wide temperature range, comparable with pure alkyl methacrylate additives. Increasing content of styrene in the additive and decreasing molar mass of the terpolymer resulted in a decrease in viscosity and viscosity index while the shear stability increased. The obtained results give guidelines for optimization of the terpolymers composition and structure in order to assure the best lubricant application properties.

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