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首页> 外文期刊>Journal of industrial and engineering chemistry >Viscous, thermal and tribological characterization of oleic and ricinoleic acids-derived estolides and their blends with vegetable oils
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Viscous, thermal and tribological characterization of oleic and ricinoleic acids-derived estolides and their blends with vegetable oils

机译：油酸和蓖麻油酸的雌二醇及其与植物油的混合物的粘度，热学和摩擦学特性

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摘要

This work deals with the viscous, thermal and tribological characterization of a variety of estolides, obtained from both oleic and ricinoleic acids, using different acid-catalysed synthesis protocols, and their blends with vegetable (high-oleic sunflower, HOSO, and castor, CO) oils. Estolides with molecular weights between 4.4 and 6.9 times higher than the originating fatty acids were obtained. Polymerization degree was larger when using the sulphuric acid-catalysed synthesis protocol. Estolides obtained from oleic acid displayed higher freezing temperatures than the fatty acid, whereas the crystallization process was delayed in estolides obtained from ricinoleic acid, yielding improved low-temperature properties. Ricinoleic acid-derived estolides showed much higher viscosity values than those prepared from the oleic acid, with values of kinematic viscosity up to around 6700 mm~2/s. In general, viscosities were related to estolide molecular weight. Significant increments in HOSO and CO viscosities were found when they were blended with estolides, especially those prepared from the ricinoleic acid using the sulphuric and p-toluensulphonic acids-catalyzed methods. Relative increments in kinematic viscosities up to 1500% and 700% were obtained for HOSO and CO, respectively. HOSO's viscosity-temperature dependence was significantly improved when it was blended with different estolides, whereas CO/oleic acid-derived estolides blends showed a more moderate improvement of CO thermal dependence. The sulphuric acid-catalysed method influences friction and wear in the ball-on-plates contact lubricated with estolides. The addition of the different estolides to HOSO or CO does not modify their frictional behavior, resulting in just one single Stribeck curve for all samples, and significantly reduces wear.
机译：这项工作涉及使用不同的酸催化合成方案，从油酸和蓖麻油酸中获得的各种雌二醇的粘度，热学和摩擦学特性，以及它们与植物（高油酸向日葵，HOSO和蓖麻，CO ）油。获得分子量比起始脂肪酸高4.4至6.9倍的雌二醇。使用硫酸催化的合成方案时，聚合度较大。从油酸得到的雌二醇显示出比脂肪酸更高的凝固温度，而从蓖麻油酸得到的雌醇的结晶过程被延迟，从而改善了低温性能。衍生自蓖麻油酸的雌二醇显示出比由油酸制备的那些高得多的粘度值，运动粘度值高达约6700mm 2 / s。通常，粘度与乙内酯分子量有关。当将它们与雌二醇混合时，尤其是由蓖麻油酸使用硫酸和对甲苯磺酸催化方法制得的雌二醇混合时，发现HOSO和CO粘度显着增加。对于HOSO和CO，运动粘度的相对增量分别达到1500％和700％。与不同的雌二醇共混时，HOSO的粘度-温度依赖性得到显着改善，而源自CO /油酸的雌二醇共混物显示出对CO热依赖性的更适度的改善。硫酸催化的方法会影响用雌醇润滑的板球接触中的摩擦和磨损。在HOSO或CO中添加不同的雌激素不会改变它们的摩擦性能，所有样品仅形成一条单一的斯特里贝克曲线，并显着降低了磨损。

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