Low friction properties of associated carboxylic acids induced by molecular orientation

Molecular alignment is key to achieving an ultra-low friction coefficient. We prepared associated carboxylic acids using oleic acid and p-pentylbenzoic acid via hydrogen bonding, involving a benzene ring and an eight-membered cyclic carboxylic acid in the molecules. We investigated frictional proper...

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Bibliographic Details
Published in:Tribology international 2017-09, Vol.113, p.36-42
Main Authors: Lu, Renguo, Mori, Shigeyuki, Tani, Hiroshi, Tagawa, Norio, Koganezawa, Shinji
Format: Article
Language:English
Subjects:
Associated carboxylic acids
Benzene
Boundary lubrication
Carboxylic acids
Chemical bonds
Fourier transforms
Friction
Hydrogen
Hydrogen bonding
Low friction
Lubricants & lubrication
Lubrication
Micro FT-IR
Molecular orientation
Oleic acid
Shearing
Viscosity
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Summary:Molecular alignment is key to achieving an ultra-low friction coefficient. We prepared associated carboxylic acids using oleic acid and p-pentylbenzoic acid via hydrogen bonding, involving a benzene ring and an eight-membered cyclic carboxylic acid in the molecules. We investigated frictional properties when these were added into a base oil and found that the associated carboxylic acids decreased the traction coefficient in EHL and boundary lubrication, although the viscosity increased. An in situ micro Fourier transform infrared spectroscope showed that both the eight-membered cyclic carboxylic acid and the benzene ring were oriented parallel to the shearing force, leading to the low friction coefficient. •Associated carboxylic acids using oleic acid and p-pentylbenzoic acid were prepared.•Associated carboxylic acids feature a benzene ring and an eight-membered cyclic carboxylic acid in the molecules.•The molecular orientation during friction were analysed using an in situ micro FTIR spectroscope.•Both the eight-membered cyclic carboxylic acid and the benzene ring were oriented parallel to the shearing force.•Low friction of associated carboxylic acids was induced by molecular orientation.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2016.10.042