Oleic acid‐based poly(alkyl methacrylate) as bio‐based viscosity control additive for mineral and vegetable oils

Abstract

This work described the design of an efficient oleic‐acid based viscosity control additive for lubricating oils as potential alternative to petroleum poly(alkyl)methacrylates (PAMAs) additives. Hence, Poly(2‐(methacryloyloxy)ethyl oleate) (PMAEO) was synthesized by free radical homopolymerization to afford a comb‐like polymer structure similar to common PAMAs. Then, in order to evaluate its efficiency as viscosity control additive, the resulting polymer was mixed at several concentrations from 1%wt to 10%wt with different oil compositions, including a mineral paraffinic oil (MPO) and an organic triglyceride oil (OTO). For all polymer‐solution blends, relative viscosities (RV) measurements showed that addition of PMAEO in MPO had a better contribution on oil viscosity at 100°C than at 20°C (RV = 1.16 at 40°C while RV = 1.25 for 3%wt of PMAEO in MPO). These results were attributed to the coil expansion of polymer chains with increasing temperature. Additionally, rheological studies showed that addition of 3%wt of PMAEO in MPO improved the MPO cold flow properties at −30°C by decreasing the required yield stress to put the oil in motion from 310 mPa to 42 mPa. These results are in total accordance with the common viscosimetric properties of PAMAs‐based viscosity control additives at low and high temperature in mineral oils. POLYM. ENG. SCI., 59:E164–E170, 2019. © 2018 Society of Plastics Engineers

Synthesis of Alkyl Sulfur‐Functionalized Oleic Acid‐Based Polymethacrylates and Their Application as Viscosity Index Improvers in a Mineral Paraffinic Lube Oil

“…The resulting alkyl sulfur‐functionalized polymers were obtained with a weight average molecular weight () of 146 and 155 kg mol −1 and broad dispersities (Đ) of 3.2 and 3.5 for PMAEO SC12 and PMAEO SC18 (determined through SEC measurements), respectively. They both displayed suitable high molar masses for VII application as demonstrated in previous studies (Lomège et al, , ).…”

Epoxidized Oleic Acid‐Based Polymethacrylates as Viscosity Index Improvers

“…However, when PMAEO was blended in an organic biobased triacylglycerol oil (1–10 wt.%), the lubricating oil acted as a too “good solvent” at low temperature, which prevented the coil polymer to further expand with temperature. It resulted in a similar thickening effect on oil viscosity at low and high temperatures instead of the expected VII properties (Lomège et al, ).…”

Impact of Different Epoxidation Approaches of Tall Oil Fatty Acids on Rigid Polyurethane Foam Thermal Insulation

“…In the past, as well as nowadays, fatty acids present in plants in the form of triglycerides are one of the most appropriate raw products for the manufacturing of bio-based materials [ 2 ]. Various chemical modification methods, such as epoxidation and ring-opening, hydroformylation, transesterification, ozonolysis, amidation and thiol-ene coupling [ 3 ], have been used to obtain various monomers and polymers with low toxicity, convenient availability and relatively low price [ 4 , 5 , 6 , 7 ]. Epoxides are one of the most versatile intermediates to be further used for the synthesis of different compounds and has a wide commercial use because of its high reactivity [ 8 ].…”