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Effect of die surface on the onset of stick-slip flow in polymer processing

Abstract : In this paper, we investigate the relationships between stick-slip defect and molecular slip at the wall for linear polymers. By considering Brochard-de Gennes slip model and molecular chain dynamics at the wall, we propose an expression for the critical shear stress at the onset of stick-slip as a function of the wettability of the polymer on the die surface or, more precisely, as a function of the apparent contact angle between polymer and die surface.
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  • HAL Id : hal-00675599, version 1

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Ahmed Allal, Bruno Vergnes, John M. Dealy. Effect of die surface on the onset of stick-slip flow in polymer processing. 27th World Congress of the Polymer Processing Society, May 2011, Marrakech, Morocco. 3 p. ⟨hal-00675599⟩

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