Effects of conformational entropy on antiwear performances of organic friction modifiers
| Autor: | Xiangli Wen, Yu Tian, Yonggang Meng, Xiangjun Zhang, Pengpeng Bai, Chuke Ouyang, Liran Ma |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Materials science Double bond Mechanical Engineering Friction modifier Surfaces and Interfaces Tribology Conformational entropy Glyceryl monostearate Surfaces Coatings and Films chemistry Chemical engineering Mechanics of Materials Molecule Cis–trans isomerism Entropy (order and disorder) |
| Zdroj: | Tribology International. 156:106848 |
| ISSN: | 0301-679X |
| DOI: | 10.1016/j.triboint.2020.106848 |
| Popis: | Organic friction modifiers (OFMs) are widely used in lubricants. However, the mechanism of their structure–activity relationship still needs further exploration. Herein, we found that glyceryl monoelaidate (GME) with a trans double bond, exhibits a better antifriction and antiwear performance than glyceryl monooleate (GMO), the cis isomer of GME. Glyceryl monostearate (GMS) with a saturated tail group is even better. The obvious different tribological performance of three different OFMs with slight molecular structure difference is attributed to the different entropy decreasing they form a boundary film on steel surfaces, which affected their surfacial-coverage. The disclosed conformation entropy effect on surfacial-coverage of boundary film could guide the design of more novel and effective OFMs. |
| Databáze: | OpenAIRE |
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