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Exploring the Effect Mechanism of Alkyl Chain Lengths on the Tribological Performance of Ionic Liquids
In this work, four
kinds of imidazole phosphate ionic liquids (ILs)
with different anionic and cationic alkyl chain lengths were synthesized.
The physicochemical properties and tribological performance of ILs
were evaluated. The experimental results revealed that the tribological
properties of ILs were positively correlated with the cationic chain
length and negatively correlated with the anionic chain length. The
effect mechanism can be summarized in two aspects: on the one hand,
anions with shorter alkyl chain lengths possess stronger adsorption
performance and better film forming ability on the friction pair surfaces,
which makes the ILs form more robust and stable lubricating film;
on the other hand, ILs with longer cationic alkyl chain lengths possess
milder tribo-chemical reactions, which can effectively enhance the
tribological performance and decrease the corrosion wear