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The progressive onset of slip at the wall, which corresponds to a slip lengthincreasing with the solicitation time before reaching a plateau, has beeninvestigated for model viscoelastic polymer solutions, allowing one to vary thelongest relaxation time while keeping constant solid - fluid interactions. Ahydrodynamic model based on a Maxwell fluid and the classical Navier'shypothesis of a linear response for the friction stress at the interface fullyaccounts for the data, without any adjustable parameter. No viscoelasticresponse needs be postulated for the friction, reflecting the local characterof solid-liquid friction mechanisms.

Viscoelasticity induced onset of slip at the wall for polymer fluids