Abstract
A Surface Force Apparatus has been used to investigate the drainage of a blend of copolymer viscosity improver additive molecules in a base oil. A quasi-static squeeze of the interface is used to characterize the first repulsion layer and the confined adsorbed layer. Moreover, dynamical measurements enlighten a significant negative value of the immobile layer thickness (−50 nm). The occurrence of slip at the wall that may result in such effect, is discussed in terms of liquid-solid interface wettability, surface roughness and cleanliness, and friction experiments. As a consequence, a modeling of the interface consisting of two layers of different viscosity is proposed. This model of interfacial molecular organization allows us to explain the drainage behaviour of the wetting liquid.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
