Molecular design to eliminate sharkskin defect for linear polymers

Ahmed Allal (1) , Bruno Vergnes (2)

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

In a preceding work, we have established relationships between the conditions of sharkskin onset and the rheological and molecular properties of the extruded polymer. Based on this approach, we propose now to define a molecular criterion, able to discriminate the ability of linear polymers to give rise to sharkskin in extrusion. The validity of this criterion is experimentally verified for a certain number of polymers, using data taken in the literature.

Mots clés: sharkskin defect; existence criterion; molecular weight distribution

Domaines: Matériaux

Ahmed Allal, Bruno Vergnes. Molecular design to eliminate sharkskin defect for linear polymers. Journal of Non-Newtonian Fluid Mechanics, 2007, 146 (1-3), pp.45-50. ⟨10.1016/j.jnnfm.2006.12.003⟩. ⟨hal-00510572⟩