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Effect of high pressure on molecular interaction between oleic acid and base oils at elasthydrodynamic lubrication contact
Author(s) -
Takiwatari Koji,
Nanao Hidetaka,
Mori Shigeyuki
Publication year - 2010
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.107
Subject(s) - lubrication , base oil , oleic acid , base (topology) , chemistry , materials science , petroleum engineering , composite material , engineering , biochemistry , mathematics , scanning electron microscope , mathematical analysis
The molecular interaction of oleic acid in different base oils at Elastohydrodynamic lubrication (EHL) contact was investigated by means of in‐situ observation with micro‐Fourier Transform Infrared Spectrometer (FTIR). Moreover, the effect of hydrostatic pressure was confirmed using a diamond‐anvil cell (DAC). Poly‐α‐olefin (PAO) with non‐polar, and Polypropylene glycol and Polybutylene glycol (PPG and PBG) which have ether group were used as base oil. When PAO was used, oleic acid interacts with itself to form a dimer. On the other hand, oleic acid interacts with PPG and PBG and exists mainly as a monomeric moelcule. The IR peak of C = O stretching mode of oleic acid dimmer was shifted to lower wavenumber at EHL contact region. The peak shift was not obvious in the case of the monomer. This result means that the hydrogen bonding of the dimer was stabilized under high pressure, but the hydrogen bonding of monomer was not. Copyright © 2010 John Wiley & Sons, Ltd.