Verification of the advantages in friction-reducing performance of organic polymers having multiple adsorption sites

This paper demonstrates the superior friction-reducing properties of organic polymer having multiple-point adsorption sites. Multiple-point adsorptive polymers showed higher transition temperature at elevated temperature experiments than the single-point adsorptive polar compounds due to their lower desorption property. It was found that the transition temperature of multiple-point adsorptive polymers increased with an increase in polarity of the base oils. This was due to the intrinsic tendency of the polymer chains to expand more in higher polarity solvents, which resulted in the polar groups of the polymers facing toward the friction surface to produce more adsorption sites.

► Multiple-point adsorptive polymers showed lower friction in lower speed region.
► The polymer prevented a drastic increase in friction with increasing oil temperature.
► Higher polar oil resulted in a better friction-reducing performance of the polymers.
► Polymer configuration changed from curling to extension with increasing oil polarity.
► Polymer configuration affected multiple-point adsorptive behaviors of polymers.