Velocity profile with wall slip between parallel-plates.
Layered sample between parallel-plates. The interface is characterized by a shear stress depending slip velocity V slip.
Apparent shear rate as a function of shear stress at two gap heights for PE and three TPEs at 180 °C.
Wall slip velocities calculated according to Eq. (3) for three TPEs. The flattening of the slope at higher stresses is due to edge fracture of the sample.
Comparison of measured steady shear viscosities (solid symbols) for three TPEs at 180 °C with calculated wall slip corrected viscosities (open symbols with lines) by use of Eq. (5) . The correction is more important for the lower viscosity-type TPEs.
Steady shear viscosities as a function of shear stress at 180 °C. The data for E880, ESP9213, and E685 are wall slip corrected according to Eq. (5) .
First normal stress difference as a function of shear rate at 180 °C measured with cone-plate geometry.
(a) Layered sample between parallel-plates at t = 0 min; (b) two examples for internal Weissenberg effect. View on top of the sample after shearing at 5 s−1 for t = 20 min at 180 °C. Each ring of mixed phase contains a core of pure material with the higher value of N 1.
Viscosity curves for all six PE/TPE systems at 180 °C. The average viscosity without slip (triangle) was calculated according to Eq. (7) .
Interfacial slip velocities according to Eq. (8) between PE and TPEs at 180 °C (symbols). Broken lines represent a slope of 1.
Thermoplastic elastomers used.
Coefficients for Eq. (9) .
Shear rates at applied shear stress of 3000 Pa.
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