Study & Research
Tribological Properties of Alkyldiphenylethers under Reciprocating Sliding Condition
Typical friction curves, as measured using the reciprocating friction tester, are shown in Figure 4. There was no obvious difference in friction coefficient during the first few minutes; however, that of C12 gradually increased with friction time, which was similar behavior to that of PAO30. The friction coefficients of C18, C20, and 2C12 stabilized within a few minutes. These results suggest that ADEs with longer alkyl chains or more attached alkyl chains preferred operating under more stable friction conditions.
Figure 4. Variation of friction coefficient with friction time under reciprocating sliding condition.
Figure 5a summarizes the averaged friction coefficients at steady state, as determined from the friction coefficient curves illustrated in Figure 4. The C12 ADE with a short alkyl chain showed the highest friction coefficient of 0.142. When the alkyl chain length increased to C18, the friction coefficient decreased to 0.105. When the alkyl chain length further increased to C20, a much lower friction coefficient of 0.095 was observed, which was 33% lower than that of C12. These results showed that the friction coefficients of ADEs strongly depended on the alkyl chain length. Moreover, 2C12, which featured more than two alkyl chains, showed the lowest friction coefficient of 0.081. The friction coefficient decreased by 43% on increasing the number of attached alkyl chains, even if the alkyl chain length was short.
Figure 5. Tribological properties under reciprocating sliding condition: (a) averaged friction coefficient
For more information please refer to the full article (below link)
- This article is an adaptation of “Tribological Properties of Alkyldiphenylethers in Boundary Lubrication” (on MDPI) by Renguo Lu, Masaya Morimoto, Hiroshi Tani, Norio Tagawa and Shinji Koganezawa, and is used under a CC-BY-4.0 International license.
https://www.mdpi.com/2075-4442/7/12/112/htm
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