Diblock polymeric friction modifier (PFM) in the boundary regime: Tribological conditions leading to low friction

The aim of this paper is to investigate the tribological conditions required obtain low friction with a diblock PIB-PEG polymer modifier (PFM) blended in base oil (PAO4 + 1% wt PFM) under severe lubrication regime. Two conditions, rolling/sliding and reciprocating pure sliding, were investigated. A very coefficient (μ ~ 0.035) was obtained at temperature 100 °C whatever tribometer used. ECR measurements, ToF-SIMS characterizations wear tracks AFM analysis suggested presence an adsorbed film on rubbing surfaces. showed that bonds steel substrate through polar functions.