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Effect of high pressure on molecular interaction between oleic acid and base oils at elasthydrodynamic lubrication contact

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.