Relationship between microstructure and mechanical properties of polyether block amide foams - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Polymer Engineering and Science Année : 2021

Relationship between microstructure and mechanical properties of polyether block amide foams

Relation microstructure comportement mécanique de mousses PEBAX

Résumé

The mechanical behaviors of five polyether block amide foams, obtained by mold-opening foam injection process, were investigated with regard to their microstructures. The materials vary in mass ratios of hard versus soft segments, and/or in process packing time. The resulting microstructures have been characterized in terms of cavity size and shape ratios, by analyzing scanning electron microscope images after careful sample preparation. The foam mechanical responses have been characterized in compression at small and large strain. At small strain, the initial linear part of the stress-strain curve is enhanced firstly by the hard segment mass ratio and secondly by the fineness of the microstructure. Similar results have been obtained at large strain. The foam viscoelasticity at large strain has been characterized by stress relaxation and strain recovery tests, relevant for foam applications. Reduced packing time and pressure have been shown to lead to the presence of undesired large cavities. The morphological defects appear to have a negligible impact on the macroscopic mechanical behavior of the foams at infinitesimal strain, but lead to critical inconsistency at large strain. Furthermore, the mechanical behavior of the tested polyether block amide foams is controlled first by hard vs. soft segments ratio, and second by the microstructure fineness
Fichier principal
Vignette du fichier
Main_manuscript_PES_vf.pdf (5.34 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03320519 , version 1 (16-08-2021)

Identifiants

Citer

Estève Ernault, Julie Diani, Simon Hallais, Clio Cocquet. Relationship between microstructure and mechanical properties of polyether block amide foams. Polymer Engineering and Science, 2021, 61 (7), pp.1971 - 1981. ⟨10.1002/pen.25712⟩. ⟨hal-03320519⟩
29 Consultations
136 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More