Erosion of the molecular network in the amorphous layers of polyethylene upon high- strain deformation

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Show simple item record BARTCZAK, Zbigniew
  303306 Polska Akademia Nauk [PAN] GRALA, Magdalena
  303306 Polska Akademia Nauk [PAN] RICHAUD, Emmanuel
  86289 Procédés et Ingénierie en Mécanique et Matériaux [Paris] [PIMM] GADZINOWSKA, Krystyna
  303306 Polska Akademia Nauk [PAN] 2017-02-22T11:18:45Z 2017-02-22T11:18:45Z 2016 2017-02-08T15:45:05Z
dc.description.abstract Samples of linear polyethylene, neat and crosslinked by irradiation with electron beam, were subjected to heavy plastic deformation by plane-strain compression up to the true strain exceeding 2 (deformation ratio λ > 8) at room temperature. Structural studies of deformed samples and investigation of long-term strain recovery demonstrated that the deformation of the neat, non-crosslinked HDPE is completely reversible above the melting point of the crystalline phase, provided that the applied true strain does not exceed e = 1.0 (λ = 2.7). At higher applied strains, e > 1, an irreversible deformation component emerged gradually, and at e = 2.1 (λ = 8.2), the permanent, truly irreversible, residual strain was approx. eres = 0.36 (λ = 1.4). In contrast, samples of crosslinked HDPE above Tm exhibited complete reversibility of deformation, irrespectively of an applied strain, and eres ≈ 0. The source of permanent irreversible strain component in neat HDPE is a deformation-induced partial destruction of the molecular network of entangled chains within amorphous interlamellar layers. The principal mechanism found was chain disentanglement, which was supplemented by a very limited chain scission. In the case of crosslinked materials, the dense and relatively homogeneous molecular network appeared robust enough to avoid any damage. Consequently, the strain appeared here fully reversible upon melting of crystalline phase. en
dc.language.iso en
dc.publisher Elsevier
dc.rights Post-print
dc.subject Semicrystalline polymer en
dc.subject Polyethylene en
dc.subject Plastic deformation en
dc.subject Molecular network en
dc.subject Entanglements en
dc.title Erosion of the molecular network in the amorphous layers of polyethylene upon high- strain deformation en hal-01473940 *
ensam.hal.status accept *
dc.identifier.doi 10.1016/j.polymer.2016.07.068
dc.typdoc Articles dans des revues avec comité de lecture
dc.localisation Centre de Paris
dc.subject.hal Chimie: Polymères
dc.subject.hal Sciences de l'ingénieur: Mécanique: Matériaux et structures en mécanique
ensam.audience Internationale 552–565
ensam.journal Polymer
ensam.volume 99
ensam.peerReviewing Oui

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