New Light on Old Wisdoms on Molten Polymers: Conformation, Slippage and Shear Banding in Sheared Entangled and Unentangled Melts - INAC-SPRAM Accéder directement au contenu
Article Dans Une Revue Macromolecular Rapid Communications Année : 2009

New Light on Old Wisdoms on Molten Polymers: Conformation, Slippage and Shear Banding in Sheared Entangled and Unentangled Melts

Résumé

The flow of viscoelastic materials is usually interpreted as resulting from intramolecular properties. Typically, the non-linear flow behaviour and sluggish relaxation dynamics in entangled polymers are interpreted by a disentanglement process. This molecular interpretation has never been validated by direct observation. We report here on in situ observations of polymer melts under steady-state shear flow using neutron scattering and particle tracking velocimetry. It is shown that the chains remain largely undeformed under steady-state shear flow whereas wall slippage and shear-banding are identified in both entangled and unentangled polymer melts. These observations are of prime importance; they reveal that the flow mechanism and its viscoelastic signature reflect a collective effect and not properties of individual chains.
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hal-03840796 , version 1 (06-11-2022)

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Laurence Noirez, Hakima Mendil-Jakani, Patrick Baroni. New Light on Old Wisdoms on Molten Polymers: Conformation, Slippage and Shear Banding in Sheared Entangled and Unentangled Melts. Macromolecular Rapid Communications, 2009, 30, pp.1709 - 1714. ⟨10.1002/marc.200900331⟩. ⟨hal-03840796⟩
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