Modification des propriétés rhéologiques des polymères branchés par traitement thermomécanique : application aux défauts d'extrusion des PEBD

Abstract : The aim of this work is to characterize the effects of shear modification on differentbranched polyethylenes. After a short description of materials and methods, we have characterizedthe rheological behaviour of the different materials, both in shear and elongation. We have alsoobtained calorimetric and molecular data, allowing us to define the molar mass betweenentanglements. Then, we have characterized the viscosity changes induced by a pre‐shear, indifferent conditions of shear rate and time, both in cone and plate and Couette geometries. We haveshown that the mechanisms of disentanglement are complex and cannot be directly explained by aunique parameter like the mass between entanglements. Finally, the observation of the extrudatesat the die exit has permitted to evidence the change in extrusion defects induced by shearmodification.
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Christian Peiti. Modification des propriétés rhéologiques des polymères branchés par traitement thermomécanique : application aux défauts d'extrusion des PEBD. Autre. Ecole Nationale Supérieure des Mines de Paris, 2012. Français. ⟨NNT : 2012ENMP0073⟩. ⟨pastel-00820611⟩

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