Modification of rheological properties of branched polyethylenes by a thermomechanical treatment

Christian Peiti (1) , Jean-Marc Haudin (1) , Bruno Vergnes (1)

1 CEMEF - Centre de Mise en Forme des Matériaux

Shear refinement has been studied in four LDPE, which have been molecularly and rheologically characterized. They have been subjected to a pre-shearing in a cone-and-plate rheometer, and the decrease of viscosity, associated with the disentanglement of macromolecules, has been analyzed as a function of different mechanical parameters: shear rate, strain, stress, specific energy. It appears that disentanglement mechanisms are complex and cannot be explained by a unique molecular parameter, e.g., the molar mass between entanglements.

Domaines: Matériaux

Christian Peiti, Jean-Marc Haudin, Bruno Vergnes. Modification of rheological properties of branched polyethylenes by a thermomechanical treatment. PPS-30: The 30th International Conference of the Polymer Processing Society, Jun 2014, Cleveland, Ohio, United States. pp.170002 - ISBN: 978-0-7354-1309-2, ⟨10.1063/1.4918520⟩. ⟨hal-01253694⟩