Large amplitude oscillatory elongation flow |
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Authors: | Henrik Koblitz Rasmussen Philippe Laillé Kaijia Yu |
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Institution: | (1) The Danish Polymer Centre, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark;(2) Department of Mechanical Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark;(3) Department of Manufacturing Engineering and Management, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark |
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Abstract: | A filament stretching rheometer (FSR) was used for measuring the elongation flow with a large amplitude oscillative elongation
imposed upon the flow. The large amplitude oscillation imposed upon the elongational flow as a function of the time t was defined as where ε is the Hencky strain, is a constant elongational rate for the base elongational flow, Λ the strain amplitude (Λ ≥ 0), and Ω the strain frequency. A narrow molecular mass distribution linear polystyrene with a molecular weight of 145 kg/mol was subjected
to the oscillative flow. The onset of the steady periodic regime is reached at the same Hencky strain as the onset of the
steady elongational viscosity ( Λ = 0). The integral molecular stress function formulation within the ‘interchain pressure’ concept agrees qualitatively with
the experiments. |
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Keywords: | Biaxial flow Oscillating flow Polystyrene Polymer melt Uniaxial extension Nonlinear viscoelasticity |
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