2024
DOI: 10.1007/s00397-024-01472-w
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Analysis of startup shear flow data of linear polystyrene blends: is shear stress undershoot caused by transient shear banding?

Manfred H. Wagner

Abstract: Startup shear stress data of a well-defined set of binary polystyrene blends consisting of monodisperse blend components were reported recently by Parisi et al. (J Non-Newtonian Fluid Mech 315:105028, 2023). They presented convincing evidence that in the fast flow of melts with narrow molar mass distribution, shear stress undershoot is observed after the overshoot and before approaching the steady state. For blends with broad relaxation time spectra, no undershoot was found. We analyze this data set by compari… Show more

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