Abstract
In this study, we present a novel method to assess the slip lengthand the viscosity of thin films of highly viscous Newtonian liquids.We quantitatively analyse dewetting fronts of low-molecular-weightpolystyrene melts on octadecyl- (OTS) and dodecyltrichlorosilane(DTS) polymer brushes. Using a thin-film (lubrication) model derivedin the limit of large slip lengths, we can extract slip length andviscosity. We study polymer films with thicknesses between 50 nmand 230 nm and various temperatures above the glass transition.We find slip lengths from 100 nm up to 1 μm on OTS- andbetween 300 nm and 10 μm on DTS-covered silicon wafers.The slip length decreases with temperature. The obtained values forthe viscosity are consistent with independent measurements.
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