Effects of conformational entropy on antiwear performances of organic friction modifiers

被引：13

作者：

Ouyang, Chuke ^{[1
]}

Bai, Pengpeng ^{[1
]}

Wen, Xiangli ^{[1
]}

Zhang, Xiangjun ^{[1
]}

Meng, Yonggang ^{[1
]}

Ma, Liran ^{[1
]}

Tian, Yu ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Mech Engn, State Key Lab Tribol, Beijing 100084, Peoples R China

来源：

TRIBOLOGY INTERNATIONAL | 2021年 / 156卷

基金：

中国国家自然科学基金;

关键词：

Glyceryl monostearate; Organic friction modifier; Antiwear; Conformational entropy;

D O I：

10.1016/j.triboint.2020.106848

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

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.

引用

页数：10