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The dewetting dynamics of ultrathin polymer films, e.g. in the model systemof polystyrene on a polydimethylsiloxane-covered substrate, exhibitsinteresting behavior like a fast decay of the dewetting velocity and a maximumin the width of the built-up rim in the course of time. These features havebeen recently ascribed to the relaxation of residual stresses in the film thatstem from the nonequilibrium preparation of the samples. Recent experiments byCoppee et al. on PS with low molecular weight, where such stresses could not beevidenced, showed however similar behavior. By scaling arguments and numericalsolution of a thin film viscoelastic model we show that the maximum in thewidth of the rim can be caused by a temporal evolution of the frictioncoefficient (or equivalently of the slip length), for which we discuss twopossible mechanisms. In addition, the maximum in the width is affected by thesample age. As a consequence, knowing the temporal behavior of friction (orslip length) in principle allows to measure the aging dynamics of apolymer-polymer interface by simple dewetting experiments.

Dewetting of thin polymer films: Influence of interface evolution