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首页> 外文期刊>Chemical Engineering Communications >Adsorption Behavior of Epoxidized Fatty Esters via Boundary Lubrication Coefficient of Friction Measurements
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Adsorption Behavior of Epoxidized Fatty Esters via Boundary Lubrication Coefficient of Friction Measurements

机译：摩擦系数的边界润滑系数对环氧脂肪酯的吸附行为

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摘要

The frictional behaviors of a variety of fatty alkenyl esters and their corresponding fatty epoxide esters (epoxy methyl oleate (EMO) and methyl oleate (MO), epoxy methyl linoleate (EMLO) and methyl linoleate (MLO), epoxy methyl linolenate (EMLEN) and methyl linolenate (MLEN)), epoxidized soybean oil (ESBO), and a commercial epoxidized 2-ethylhexyl transesterified soybean oil ( VF) as additives in hexadecane have been examined in a boundary lubrication test regime using steel contacts. Langmuir critical additive concentrations were determined, which provide the following order of negative adsorption energies: ESBO > VF > EMO>= EMLO > EMLEN and MLEN >= MLO > MO. Thus, for the similar epoxidized materials the greater degree of epoxidation results in less negative calculated total adsorption energies; this trend is reversed for the olefinic parent systems. This ordering agrees with that obtained via a more complex unconstrained cooperative interaction adsorption model. Fits of the steady-state coefficient of friction (COF) versus concentration data indicate an inverse relation of the obtained interaction parameters (alpha) with the primary adsorption energies (E). These results demonstrate the complexity of the adsorption mechanism that occurs.
机译：多种脂肪链烯基酯及其相应的脂肪环氧化物酯（环氧油酸甲酯（EMO）和油酸甲酯（MO），环氧亚油酸甲酯（EMLO）和亚油酸甲酯（MLO），环氧亚油酸甲酯（EMLEN）和使用钢触点在边界润滑测试方案中对亚油酸甲酯（MLEN）），环氧化大豆油（ESBO）和商用环氧化2-乙基己基酯交换大豆油（VF）作为十六烷中的添加剂进行了测试。确定兰格缪尔临界添加剂浓度，其提供以下负吸附能顺序：ESBO> VF> EMO> = EMLO> EMLEN和MLEN> = MLO> MO。因此，对于相似的环氧化材料，较大的环氧化程度导致负的计算总吸附能较小;反之，对于烯烃母体体系，这种趋势是相反的。该顺序与通过更复杂的无约束协作相互作用吸附模型获得的顺序一致。稳态摩擦系数（COF）与浓度数据的拟合表明，所获得的相互作用参数（α）与一次吸附能（E）呈反比关系。这些结果证明了发生的吸附机理的复杂性。

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