Adsorption Behavior of Heat Modified Soybean Oil via Boundary Lubrication Coefficient of Friction Measurements

2008 ◽  
Author(s):  
Brajendra K. Sharma ◽  
Girma Biresaw ◽  
Sevim Z. Erhan
Keyword(s):  
Soybean Oil ◽  
Metal Surface ◽  
Boundary Lubrication ◽  
Average Molecular Weight ◽  
Relative Distribution ◽  
Adsorption Model ◽  
Free Energy Of Adsorption ◽  
Soybean Oils ◽  
Modified Soybean Oil ◽  
Friction Measurements

The frictional behaviors of soybean oil and heat modified soybean oils with different Gardner scale viscosities as additives in hexadecane have been examined in a boundary lubrication test regime (steel contacts) using Langmuir adsorption model. The free energy of adsorption (ΔGads) of various heat modified soybean oils were compared with unmodified soybean oil. It was observed, that relative distribution of unsaturation in the molecule, average molecular weight and thus viscosity can affect adsorption on the metal surface. Heat modified soybean oils consistently have a lower ΔGads values compared to unmodified soybean oil. Lower ΔGads corresponds to stronger adsorption on the metal surface. The heat modification thus provides oils with stronger adsorption and higher viscosities, good for use in industrial lubricant formulations. This information can be used to design suitable lubricant molecules that will have optimum structure for effective metal adsorption as well as exhibit excellent boundary lubrication properties.

Adsorption Modeling of Fatty and Oleic Estolide Esters via Boundary Lubrication Coefficient of Friction Measurements

2005 ◽  
Author(s):  
T. L. Kurth ◽  
S. C. Cermak ◽  
J. A. Byars ◽  
G. Biresaw
Keyword(s):  
Boundary Lubrication ◽  
Adsorption Model ◽  
Fatty Esters ◽  
Cooperative Adsorption ◽  
Interaction Terms ◽  
Adsorption Modeling ◽  
Adsorption Energies ◽  
Friction Measurements ◽  
Negative Adsorption ◽  
Test Regime

The frictional behaviors of a variety of fatty esters (methyl palmitate (MP), methyl laurate (ML), and 2-ethylhexyl oleate (EHO)) and oleic estolide esters (methyl oleic estolide ester (ME) and 2-ethylhexyl oleic estolide ester (EHE)) as additives in hexadecane have been examined in a boundary lubrication test regime using steel contacts. Critical additive concentrations were defined and used to perform novel and simple Langmuir analyses that provide an order of adsorption energies: EHE ≥ ME > EHO > MP > ML. Application of a general adsorption model indicates slight cooperative adsorption of EHE, ME, and EHO. MP and ML data require larger attractive interaction terms (α ≤ −2.3) to be adequately fit. Irrespective of ester functionality increasingly negative adsorption energies appear to correlate with molecular weight. This suggests that multiple site coverage and multiple adsorptive interactions are likely for each of the esters studied.

Preparation of thermoset composites from natural fibres and acrylate modified soybean oil resins

2009 ◽  
Vol 114 (4) ◽  
pp. 2502-2508 ◽  
Author(s):  
Dan Åkesson ◽  
Mikael Skrifvars ◽  
Pernilla Walkenström
Keyword(s):  
Soybean Oil ◽  
Natural Fibres ◽  
Thermoset Composites ◽  
Modified Soybean Oil

Enzymatic Products from Modified Soybean Oil Containing Hydrazinoester

2008 ◽  
pp. 76-85 ◽  
Author(s):  
Atanu Biswas ◽  
R. L. Shogren ◽  
J. L. Willet ◽  
Sevim Z. Erhan ◽  
H. N. Cheng
Keyword(s):  
Soybean Oil ◽  
Modified Soybean Oil

scholarly journals Plasticization Effect of Bio-Based Plasticizers from Soybean Oil for Tire Tread Rubber

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 623 ◽  
Author(s):  
Haoshu Xu ◽  
Tao Fan ◽  
Neng Ye ◽  
Weidong Wu ◽  
Daye Huang ◽  
...  
Keyword(s):  
Soybean Oil ◽  
Crosslink Density ◽  
Plasticization Effect ◽  
Additive Content ◽  
Resistance Property ◽  
Modified Soybean Oil ◽  
Aging Resistance ◽  
Harmful Effects ◽  
Tread Rubber ◽  
Better Than

Modified soybean oil (MSO) is synthesized from soybean oil (SO) and sulfur, aiming to reduce the double bond quantity of SO and avoid harmful effects on the crosslink density and mechanical properties of rubber. MSO modified with different weight percentages of sulfur is then used to plasticize tire tread rubber (TR). It is found that the crosslink density and modulus of MSO- plasticized rubber are significantly improved compared with that of SO-plasticized TR. MSO modified with 6 wt % sulfur (MSO-6%) exhibits the best plasticization effect on TR, thus, the plasticization effect of MSO-6% on TR was further studied by adjusting its additive content. Thereafter, the Mooney viscosity, Payne effect, mechanical property of different amount of MSO-6% plasticized TR are studied to investigate their plasticization effect. At the same additive content of plasticizer, the plasticization effect of MSO-6% and a commonly used aromatic hydrocarbon plasticizer (AO) is compared to determine the potential application of MSO on tire tread rubber. It is found MSO shows similar plasticization effect on TR compared with AO. More important, the aging resistance property and wear resistance property of MSO-6% plasticized rubber are better than those of AO-plasticized rubber. Therefore, MSO-6% is a promising bio-based plasticizer for tire tread rubber.

Effect of boron-nitrogen modified soybean oil additive on biodegradability, anti-oxidation property, and lubricity of rapeseed oil

2019 ◽  
Vol 234 (2) ◽  
pp. 282-291 ◽  
Author(s):  
Ping Liu ◽  
Xin Wang ◽  
Jiang Wu ◽  
Wang Lin ◽  
Yanhan Feng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Soybean Oil ◽  
Rapeseed Oil ◽  
Energy Dispersive Spectrometer ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Modified Soybean Oil ◽  
Wear And Friction ◽  
Friction Reducing ◽  
Boron Nitrogen

Two novel boron-nitrogen modified soybean oil additives with different length of chain structures (abbreviated as BNS1 and BNS2) were synthesized. The thermal stability of BNS1 and BNS2 was evaluated by thermo-gravimetric analysis. The effect of the as-synthesized additives on the biodegradability, anti-oxidation property, and lubricity in rapeseed oil was evaluated by respective standard method. Moreover, the morphology and tribochemical characteristics of the worn surfaces were examined by scanning electron microscope assembled with energy dispersive spectrometer. The results indicated that BNS1 and BNS2 both possess good thermal stability; BNS1 slightly impairs the biodegradability of rapeseed oil, but BNS2 facilitates the biodegradability of rapeseed oil. BNS1 and BNS2 could improve the anti-wear and friction-reducing performance of the rapeseed oil, but BNS1 exhibited better anti-wear ability as compared to that of BNS2, BNS2 exhibited better anti-wear ability in reducing friction coefficients as compared to that of BNS1. The enhanced anti-wear and friction-reducing abilities of rapeseed oil were ascribed to the formation of a composite boundary lubrication film due to the strong adsorption of BNS1 or BNS2 and rapeseed oil onto the lubricated surfaces and their tribochemical reactions with metal surfaces. BNS1 and BNS2 could both facilitate the anti-oxidation properties of the rapeseed oil.

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