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首页> 外文会议>World Tribology Congress III vol.1; 20050912-16; Washington,DC(US) >ADSORPTION MODELING OF FATTY AND OLEIC ESTOLIDE ESTERS VIA BOUNDARY LUBRICATION COEFFICIENT OF FRICTION MEASUREMENTS
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ADSORPTION MODELING OF FATTY AND OLEIC ESTOLIDE ESTERS VIA BOUNDARY LUBRICATION COEFFICIENT OF FRICTION MEASUREMENTS

机译：通过摩擦测量的边界润滑系数对脂肪和油性甾体酯的吸附建模

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摘要

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.
机译：多种脂肪酸酯（棕榈酸甲酯（MP），月桂酸甲酯（ML）和油酸2-乙基己酯（EHO））和油性内酯酯（甲基油性内酯酯（ME）和2-乙基己基油性内酯酯）的摩擦行为（EHE））作为十六烷中的添加剂，已经在边界润滑测试方案中使用钢触点进行了检查。定义了关键的添加剂浓度，并将其用于执行新颖且简单的Langmuir分析，从而提供了吸附能的顺序：EHE≥ME> EHO> MP> ML。通用吸附模型的应用表明EHE，ME和EHO的轻微协同吸附。 MP和ML数据需要较大的有吸引力的交互作用项（α≤-2.3）才能完全拟合。不管酯官能度如何，越来越多的负吸附能似乎与分子量相关。这表明所研究的每种酯均可能具有多个位点覆盖和多个吸附相互作用。

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