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We present an experimental method allowing to quantify slip at the wall inviscous polymer fluids, based on the observation of the evolution under simpleshear flow of a photobleached pattern within a fluorescent labeled polymermelt. This straightforward method provides access to slip length at top andbottom interfaces in the 1 $\mu$m to 1 mm range and to the actual shear rateexperienced by the fluid. Based on simple optical imaging and image analysistechniques, this method affords an improvement compared to previously reportedmethods in which the photobleached fluorescence intensity profiles before andafter shear were compared and measured by scanning a photomultiplier. Thepresent method relies on a direct determination of the displacement profileinside the polymer fluid from an analysis of the 3D evolution of the wholephotobleached pattern. We demonstrate the potential of this method withmeasurements of the slip length for an entangled PDMS melt, as a function ofthe shear rate, in contact with several weakly surfaces i.e. end-tethered PDMSor polystyrene (PS) chains, a self-assembled monolayer (SAM) oftrimethoxy(octadecyl)silane (OTS), and a glassy PS thin-film.

Comparison of the slip of a PDMS melt on weakly adsorbing surfaces measured by a new photobleaching-based technique