Abstract
The present work described the synthesis of dicarboxylic acids based ionic liquids containing 1,1,3,3-tetramethylguanidinium (TMG) cation by a facile neutralization reaction. The resulted ionic liquids (ILs) were used for the first time as lubricant additives for tribological study and displayed a significant reduction in both friction and wear in polyol base oil for a steel-steel interface. Among the four synthesized ILs having different dicarboxylic acids like dodecanoic acid (DodA), sebacic acid (SebA), suberic acid (SubA) and adipic acid (AdiA) at the optimum additive dose (0.05%), a maximum reduction of 55% was observed for IL having tetramethylguanidinium cation with suberic acid[TMG][SubA] and the maximum wear reduction of 58% observed for IL [TMG][Dod]. The improved tribo-properties of IL blends are attributed to the generation of a boundary lubrication film by the tribochemical reaction between the molecules of ILs and metal atoms/oxides of interacting surfaces.
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