Polymers additive for improving the flow properties of lubricating oil

Shara, S. I.; Eissa, E. A.; Basta, J. S.

doi:10.1016/j.ejpe.2017.12.001

Cited by 38 publications

(34 citation statements)

References 12 publications

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“…Addition of poly(MMA‐ co ‐ethylene) copolymer increases the thermal stability of the neat lubricating oil by approximately 40°C with a single stage decomposition pattern. Similar increment in decomposition temperature was also observed by Shara et al with ethylene propylene diene monomer (EPDM) as additive in lubricating oil 49 …”

Section: Resultssupporting

confidence: 82%

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Functionalized polyethylene on property enhancement of lubricating oil and their performance evaluation study

Baruah

Saikia

Bora

et al. 2022

J of Applied Polymer Sci

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Methyl methacrylate (MMA) functionalized polyethylene additives for improving the properties of lubricating oil has been investigated in which poly(MMA-co-ethylene) were synthesized by using three different polymerization techniques such as miniemulsion, post polymerization and reverse atom transfer radical polymerization with 1.0 molL À1 of MMA and 20 bar of ethylene pressure. The copolymers are block in nature with the composition of 1:3 molar ratios of ethylene:MMA which is independent of polymerization techniques used. 1 H NMR analysis confirmed the successful incorporation of the copolymers in the lubricating oil. Thermogravimetric analysis reveals that the addition of poly(MMA-co-ethylene) increases thermal stability of the additive doped lubricating oil by approximately 40 C with a single stage decomposition pattern. Flash point measurements show an increasing flash point values for copolymer doped lubricating oil. From rheological study, the viscosity index of base lubricating oil has found significant increases from 102 to 129 with the addition of poly(MMA-co-ethylene) and the higher molecular weight (MW) of this copolymer provides better thickening efficiency. However, copolymer with higher MW seems to be more susceptible to mechanical degradation resulting in lower shear stability whereas copolymer with lower MW acts as a better pour point depressant.

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Section: Resultssupporting

confidence: 82%

“…On the other hand, the increasing viscosity with higher polymer concentration is due to the increased interaction between the copolymer chain and oil molecules. This increases the polymer coil volume and accordingly, increases viscosity of the copolymer doped lubricating oil 10,49 …”

Section: Resultsmentioning

confidence: 99%

Functionalized polyethylene on property enhancement of lubricating oil and their performance evaluation study

Baruah

Saikia

Bora

et al. 2022

J of Applied Polymer Sci

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“…The addition of PS shifts the oil distribution toward the lubricating oils area. In fact, it is known that the polymers are used as additives to improve the flow properties of lubricating oil; however, the physical property changes of crude oil still require further study.…”

Section: Resultsmentioning

confidence: 99%

Screening and Optimization of Microalgae Biomass and Plastic Material Coprocessing by Hydrothermal Liquefaction

Guo

Yang

et al. 2021

ACS EST Eng.

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In the past decade, microalgae biomass has been attracting considerable interest in valuable biocomponents and biofuel production. Meanwhile, plastic waste handling has become one of the most pressing global environmental concerns. Coprocessing of plastic waste and biomass has previously been reported to produce good quality fuel oil and high-value chemicals. In this study, we examined a coliquefaction process (co-HTL) of 2 microalgae, Chlorella vulgaris (Cv) and Nannochloropsis gaditana (Ng), with nine types of common plastics. In a first step, the co-HTL process was conducted in microautoclave reactors with a fixed algae/plastic mass ratio (50:50) at a temperature of 350 °C and a pressure of 16 MPa for a holding time of 15 min. Among the different types of plastics, positive synergistic effects between polycarbonate (PC), polystyrene (PS), and microalgae have been observed: (1) Plastics showed greater decomposition. (2) HTL crude oil yields were increased. Ng algae exhibits a higher interaction ability with plastics. Then, PC and PS were coprocessed with Ng algae using the response surface methodology to optimize the effects of temperature (300−400 °C), algae/plastic mass ratio (20:80−80:20), and holding time (5−45 min) on HTL crude oil yield. Software-based data analysis of the co-HTL experiments were conducted, and the optimal parameters were proposed, which were verified by the experiment results; Ng+PC (20:80 wt %) exhibits the highest crude oil yield of 67.2% at 300 °C with a 5 min holding time, while Ng+PS (80:20 wt %) generates 51.4 wt % crude oil yield at 400 °C and a 25 min holding time. Finally, the analytical results of elemental analysis, FTIR, 1 H NMR, GPC, GC-MS, and TGA on the crude oil produced from pure microalgae HTL and co-HTL were compared, indicating that Ng+PC crude oil is more suitable for aromatic chemicals production and Ng+PS crude oil could be more favorable for biofuel applications.

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“…Additives are mainly chemical compounds that improve the lubrication properties. The introduction of additives to improve the viscosity of lubricants is vital [2]. This changes the linear relationship between the shear rate and shear stress making the lubricant to become non-Newtonian.…”

Section: Nomenclaturesmentioning

confidence: 99%

Power Law Fluid Model for Thermal Elastohydrodynamic Lubrication

Karimi

Gathungu

2021

JAMCS

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The aim of this paper is to analyse thermal elastohydrodynamic lubrication (TEHL) line contact of rolling a bearing using a non-Newtonian uid that is described by the power law model. The performance characteristics of the rolling bearing are determined for various index for dilatant, Newtonian and pseudo plastic uids. The one-dimensional Reynolds and energy equations are both modied to incorporate the non-Newtonian nature of the lubricant. The coupled system of governing equations are discretized using the finite difference method and solved simultaneously. The results show that the pressure, film thickness and temperature for dilatant uids increased with increase in the ow index as compared to pseudo plastic uids. The in uence of thermal effects on pressure and lm thickness is more significant compared with that under isothermal elastohydrodynamic lubrication especially on the case of dilatant uids. The viscosity of the lubricant increases with increase in pressure and reduces with increment in temperature. The surface roughness in the bearing surface increases the lm thickness of the lubricant. The uid pressure, film thickness and temperature increases with increase in the bearing speed. To truly re ect the characteristics of EHL models, thermal effects should be considered.

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Polymers additive for improving the flow properties of lubricating oil

Cited by 38 publications

References 12 publications

Functionalized polyethylene on property enhancement of lubricating oil and their performance evaluation study

Functionalized polyethylene on property enhancement of lubricating oil and their performance evaluation study

Screening and Optimization of Microalgae Biomass and Plastic Material Coprocessing by Hydrothermal Liquefaction

Power Law Fluid Model for Thermal Elastohydrodynamic Lubrication

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