Novel polyol-based deep eutectic solvent: a potential candidate for bio-lubricant and additive for tribological performance

The present study demonstrates the synthesis of novel polyol-based deep eutectic solvents, named as PDES, which can be utilized as an industrial lubricant for MEMS applications and as anti-wear, anti-corrosive additive for biodegradable lubricants. The synthesized PDES was characterized by FT-IR and NMR for structural determination. The performance evaluation of the tribological properties of synthesized bio-additives was carried out by using a four-ball tribotester. Scanning electron microscope (SEM) appended with energy dispersive x-ray spectroscopy (EDX) was used to characterize the worn surfaces. The synthesized additive showed excellent tribo-performance in terms of anti-wear and anti-friction properties when blended with cotton seed oil. The maximum reduction in coefficient of friction and wear scar diameter was found to be 56% and 89.42%, respectively at 5 wt% dose of the additive.