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

Ahmed Allal (1) , Bruno Vergnes (2) , John M. Dealy (3)

1 IPREM - Institut pluridisciplinaire de recherche sur l'environnement et les matériaux
2 CEMEF - Centre de Mise en Forme des Matériaux
3 Department of Chemical Engineering [Montréal]

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.

Mots clés: stick-slip defect; polymers; die surface

Domaines: Sciences de l'ingénieur [physics]; Matériaux

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⟩