We studied polymer-polymer interfacial slip in bilayer films of highly immiscible (interaction parameter, χ0.1) polyethylene and fluoropolymer from medium to higher shear stresses (10–200 kPa) using both visualization and stress reduction. We found good agreement between results from the two methods as well as with previous studies using multilayers by Lee et al [J. Rheol.53, 893

915
(2009)] and visualization of flow in a transparent capillary by Migler et al [J. Rheol.45, 565
581
(2001)]
. We observed two power-law regions: Vslipτ6.2 with a transition to Vslipτ1.8 at 50 kPa. This is in contrast to the theory of Brochard-Wyart and de Gennes [C. R. Acad. Sci., Ser. II: Mec., Phys., Chim., Sci. Terre Univers317, 13
17
(1993)]
, which predicts a transition from infinite slope to a slope of one at a critical stress.

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