The Experts below are selected from a list of 52062 Experts worldwide ranked by ideXlab platform
Brajendra K Sharma - One of the best experts on this subject based on the ideXlab platform.
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friction and wear behavior of thioether hydroxy Vegetable Oil
Tribology International, 2009Co-Authors: Atanu Adhvaryu, Brajendra K Sharma, Sevim Z ErhanAbstract:Abstract This work describes the tribochemical evaluation of Vegetable Oil based antiwear additive obtained through chemical modification. The Sulfur was incorporated using a chemical reaction of epoxidized Vegetable Oil and common thiols, resulting in formation of a hydroxy thioether derivative of Vegetable Oils. The synthesis retains the Vegetable Oil structure, eliminates poly-unsaturation in the molecule, and adds polar functional groups that significantly improve adsorption on metal surfaces. These additives are obtained by chemical modification of Oils originated from natural resources. The tribochemical behavior of sulfur incorporated Vegetable Oil was studied by measuring friction coefficient using ball-on-disk configuration and wear scar diameter using four-ball configuration. Comparative tests with commercial antiwear additives demonstrate the effectiveness of these derivatives. The derivatives were found useful as agriculturally based antiwear additives for lubricant applications.
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oxidation and low temperature stability of Vegetable Oil based lubricants
Industrial Crops and Products, 2006Co-Authors: Sevim Z Erhan, Brajendra K Sharma, Joseph M PerezAbstract:Vegetable Oils are promising candidates as base fluid for eco-friendly lubricants because of their excellent lubricity, biodegradability, viscosity–temperature characteristics and low volatility. Their use, however, is restricted due to low thermo-oxidative stability and poor cold flow behavior. This paper presents a systematic approach to improve the oxidation behavior and low temperature fluidity of Vegetable Oil derivatives. Among the various possible avenues available, the combination of chemical additives, diluent (polyalphaolefin), and high-oleic Vegetable Oils offer the best option for achieving the ultimate goal. Vegetable Oil-based lubricants formulated using the above approach exhibit superior oxidative stability, and improved low temperature properties such as pour points compared to commercially available industrial Oils such as bio-based hydraulic fluids. The above Vegetable Oil-based formulations compare at par with petroleum-based lubricants for use in high-temperature applications and often outperform the competition in some of its properties.
Sevim Z Erhan - One of the best experts on this subject based on the ideXlab platform.
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friction and wear behavior of thioether hydroxy Vegetable Oil
Tribology International, 2009Co-Authors: Atanu Adhvaryu, Brajendra K Sharma, Sevim Z ErhanAbstract:Abstract This work describes the tribochemical evaluation of Vegetable Oil based antiwear additive obtained through chemical modification. The Sulfur was incorporated using a chemical reaction of epoxidized Vegetable Oil and common thiols, resulting in formation of a hydroxy thioether derivative of Vegetable Oils. The synthesis retains the Vegetable Oil structure, eliminates poly-unsaturation in the molecule, and adds polar functional groups that significantly improve adsorption on metal surfaces. These additives are obtained by chemical modification of Oils originated from natural resources. The tribochemical behavior of sulfur incorporated Vegetable Oil was studied by measuring friction coefficient using ball-on-disk configuration and wear scar diameter using four-ball configuration. Comparative tests with commercial antiwear additives demonstrate the effectiveness of these derivatives. The derivatives were found useful as agriculturally based antiwear additives for lubricant applications.
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oxidation and low temperature stability of Vegetable Oil based lubricants
Industrial Crops and Products, 2006Co-Authors: Sevim Z Erhan, Brajendra K Sharma, Joseph M PerezAbstract:Vegetable Oils are promising candidates as base fluid for eco-friendly lubricants because of their excellent lubricity, biodegradability, viscosity–temperature characteristics and low volatility. Their use, however, is restricted due to low thermo-oxidative stability and poor cold flow behavior. This paper presents a systematic approach to improve the oxidation behavior and low temperature fluidity of Vegetable Oil derivatives. Among the various possible avenues available, the combination of chemical additives, diluent (polyalphaolefin), and high-oleic Vegetable Oils offer the best option for achieving the ultimate goal. Vegetable Oil-based lubricants formulated using the above approach exhibit superior oxidative stability, and improved low temperature properties such as pour points compared to commercially available industrial Oils such as bio-based hydraulic fluids. The above Vegetable Oil-based formulations compare at par with petroleum-based lubricants for use in high-temperature applications and often outperform the competition in some of its properties.
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gel permeation chromatography of Vegetable Oil based printing ink vehicles
Journal of Applied Polymer Science, 1992Co-Authors: Sevim Z Erhan, M O BagbyAbstract:The apparent weight-average molecular weights (Mw) of ink vehicles made from soybean, safflower, sunflower, cottonseed, and canola Oils were compared by gel permeation chromatography (GPC), and the correlation between viscosity and Mw of these vehicles was established. Apparent Mw of Vegetable Oil gels that were used in vehicle preparation were also obtained by GPC. © 1992 John Wiley & Sons, Inc.
Joseph M Perez - One of the best experts on this subject based on the ideXlab platform.
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oxidation and low temperature stability of Vegetable Oil based lubricants
Industrial Crops and Products, 2006Co-Authors: Sevim Z Erhan, Brajendra K Sharma, Joseph M PerezAbstract:Vegetable Oils are promising candidates as base fluid for eco-friendly lubricants because of their excellent lubricity, biodegradability, viscosity–temperature characteristics and low volatility. Their use, however, is restricted due to low thermo-oxidative stability and poor cold flow behavior. This paper presents a systematic approach to improve the oxidation behavior and low temperature fluidity of Vegetable Oil derivatives. Among the various possible avenues available, the combination of chemical additives, diluent (polyalphaolefin), and high-oleic Vegetable Oils offer the best option for achieving the ultimate goal. Vegetable Oil-based lubricants formulated using the above approach exhibit superior oxidative stability, and improved low temperature properties such as pour points compared to commercially available industrial Oils such as bio-based hydraulic fluids. The above Vegetable Oil-based formulations compare at par with petroleum-based lubricants for use in high-temperature applications and often outperform the competition in some of its properties.
J M Franco - One of the best experts on this subject based on the ideXlab platform.
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the use of rosemary extracts in Vegetable Oil based lubricants
Industrial Crops and Products, 2014Co-Authors: M A Delgado, C Garciarico, J M FrancoAbstract:The use of Vegetable Oils as basestocks represents an important alternative to mineral lubricants. However, Vegetable Oil oxidation is a serious disadvantage for its use as a lubricant. In this sense, the use of natural antioxidant additives, which were obtained by different extraction processes from the rosemary plant, has been investigated to prevent the oxidation process in two selected potential Vegetable Oil-based lubricants (high oleic sunflower (HOSO) and castor (CO) Oils). A variety of rosemary extracts with a different distribution of phenolic diterpene compounds have been obtained depending on the solvent used (n-hexane, methanol or 50% (v/v) methanol–water). The antioxidant resistance of these Oils containing rosemary extract has been analyzed under accelerated conditions using both the ASTM D942-02 and ASTM E2009-08 standards. The results showed that the rosemary extracts are better solubilized in CO than in HOSO, obtaining the highest oxidation onset temperatures in CO. In addition to this, the rosemary extracts obtained with polar solvents had the highest concentration of rosmarinic acid, and showed a better antioxidant activity in CO; whereas the extract obtained with a non polar solvent had the highest concentration of carnosic acid, showing a better antioxidant activity in HOSO than the rest of rosemary extracts studied.
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low temperature flow behaviour of Vegetable Oil based lubricants
Industrial Crops and Products, 2012Co-Authors: L A Quinchia, M A Delgado, J M Franco, H A Spikes, C GallegosAbstract:Abstract Low temperature performance is one of the main constraints concerning the use of Vegetable Oils as lubricants, more than mineral or synthetic Oil-based lubricants. In this work, the low-temperature behaviour of a variety of Vegetable Oil basestocks for lubricating applications, as well as their blends with some viscosity improvers and pour point additives, was studied through pour point determinations, thermal analysis (DSC) and viscosity measurements at low temperature. The concentration of polyunsaturated fatty acids (PUFAs) was found a predominant parameter influencing the low-temperature properties of Vegetable Oil-based lubricants. The pour point depressant (PPD) additives used had a positive influence by lowering the pour point and increasing the low-temperature performance of the Vegetable Oils studied, which was found dependent on Vegetable Oil fatty acid composition. In this sense, the most striking result was shown by the sunflower (SO)/PPD blend, whose pour point temperature reached −36 °C in comparison to −18 °C for the neat Oil. By contrast, the worst result was obtained for the high oleic sunflower Oil (HOSO)/PPD blend (−21 °C) in comparison with HOSO (−18 °C). On the other hand, it was found that the ethyl cellulose (EC), used as viscosity modifier, induces a delay in HOSO crystallization, producing a similar effect than PPD tested, besides increasing the viscosity. However, the ethylene–vinyl acetate copolymer (EVA) induces an undesirable increase in HOSO viscosity at around 13 °C.
Y Sang - One of the best experts on this subject based on the ideXlab platform.
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physical chemical and rheological properties of waste edible Vegetable Oil rejuvenated asphalt binders
Construction and Building Materials, 2014Co-Authors: Meizhu Chen, Binbin Leng, Y SangAbstract:Abstract The effect of waste edible Vegetable Oil on rejuvenation of aged asphalt binders was investigated in terms of physical, chemical and rheological properties. Three aged asphalts prepared by three virgin asphalts with different types and penetration grades after laboratory simulation of aging of asphalt, were added with five concentrations of waste edible Vegetable Oil. The results indicate that waste edible Vegetable Oil can effectively soften aged asphalt. Meanwhile, physical properties and rheological properties of three aged asphalts can be improved to that of their corresponding virgin asphalts when the dosage of waste edible Vegetable Oil is optimum. Moreover, aging resistance, rutting resistance and elastic recovery performance of aged asphalts with waste edible Vegetable Oil can also be improved, while asphaltenes content and intensity of carbonyl and sulfoxide of aged asphalt were decreased due to the addition of waste edible Vegetable Oil. However, low temperature flexibility, elasticity and thermostability of aged asphalts with waste edible Vegetable Oil need to be further improved, especially for SBS modified asphalt binder.
