Aqueous droplets sliding down homogeneous plates of silicone elastomers exhibit an unexpected behavior: two successive regimes with two different constant speeds are identified, with a sharp transition between them. This dynamics is surprising, as there is no modification of the substrate below the droplet. By analyzing both the motion of the liquid inside the droplet and the evolution of its interfacial properties, we show that the unexpected dynamics is due to the migration of uncrosslinked silicone oligomers from the elastomer to the water-air interface.
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