Shape of the MWD to remove the sharkskin = Forme de la distribution des masses molaires pour supprimer le défaut de peau de requin

Ahmed Allal (1) , Bruno Vergnes (2) , Gérard Marin (1)

1 PCP - Physico-chimie des polymères
2 CEMEF - Centre de Mise en Forme des Matériaux

In this Note, we focused on the sharkskin defect, classically observed in linear polymer extrusion. The aim of this work is to link the sharkskin onset to the rheological properties of polymer melt and more particularly to the shape of the molecular weight distribution. Using the model of Brochard-de Gennes, we show that it is possible to eliminate the sharkskin if Mn ≈ 10 Me.

Mots clés: Low instability; Modelling; Polymer; Sharkskin

Domaines: Matériaux

Ahmed Allal, Bruno Vergnes, Gérard Marin. Shape of the MWD to remove the sharkskin = Forme de la distribution des masses molaires pour supprimer le défaut de peau de requin. Comptes Rendus. Physique, 2007, 8 (1), pp.Pages 109-114. ⟨10.1016/j.crhy.2006.12.012⟩. ⟨hal-00510646⟩