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Modification des propriétés rhéologiques de polyéthylènes branchés par traitement thermomécanique

Abstract : Shear refinement has been studied in four LDPE, which have been characterized molecularly and rheologically. 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.
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  • HAL Id : hal-01108909, version 1
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Christian Peiti, Jean-Marc Haudin, Bruno Vergnes. Modification des propriétés rhéologiques de polyéthylènes branchés par traitement thermomécanique. Rhéologie, Groupe français de rhéologie, 2014, 25, pp.49 - 57. ⟨hal-01108909⟩

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