Origin of embrittlement in Polyamide 6 ...
Type de document :
Article dans une revue scientifique
URL permanente :
Titre :
Origin of embrittlement in Polyamide 6 induced by chemical degradations: mechanisms and governing factors
Auteur(s) :
Deshoulles, Q. [Auteur]
Institut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
Le Gall, M. [Auteur]
Dreanno, C. [Auteur]
Institut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
Arhant, M. [Auteur]
Stoclet, Gregory [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Priour, Daniel [Auteur]
Le Gac, Pierre Yves [Auteur]
Institut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
Institut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
Le Gall, M. [Auteur]
Dreanno, C. [Auteur]
Institut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
Arhant, M. [Auteur]
Stoclet, Gregory [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Priour, Daniel [Auteur]
Le Gac, Pierre Yves [Auteur]
Institut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
Titre de la revue :
Polymer Degradation and Stability
Nom court de la revue :
Polymer Degradation and Stability
Pagination :
109657
Éditeur :
Elsevier BV
Date de publication :
2021-09
ISSN :
0141-3910
Discipline(s) HAL :
Chimie/Matériaux
Résumé en anglais : [en]
Polyamide 6 films were immersed in two ageing environments inducing either only oxidation or only
hydrolysis of the polymer for up to two years. Ageing temperatures ranged from 80°C to 140°C. Samples
were characterized ...
Lire la suite >Polyamide 6 films were immersed in two ageing environments inducing either only oxidation or only hydrolysis of the polymer for up to two years. Ageing temperatures ranged from 80°C to 140°C. Samples were characterized periodically in terms of both chemical structure at the macromolecular scale, using SEC, DSC, SASX and WAXS, and mechanical behaviour through tensile tests. Both degradation mechanisms lead to chain scission within the polymer, an increase in crystallinity ratio, a decrease in the amorphous layer thickness and an embrittlement of the polymer. First a decrease in the strain at break is observed while the maximal stress remains unchanged. Then a drop in maximal stress is identified. Using these experimental results, both the origin of the embrittlement and the factors governing embrittlement are discussed. The decrease in strain at break is attributed for the first time in polyamide to the decrease in concentration of tie molecules determined through a theoretical approach. The loss in entanglements is associated with the drop in maximal stress. Furthermore, it is shown that the crystallinity ratio does not govern the embrittlement of polyamide. However, both the molar mass and the amorphous layer thickness are faithful indicators of this embrittlement whatever the degradation mechanism.Lire moins >
Lire la suite >Polyamide 6 films were immersed in two ageing environments inducing either only oxidation or only hydrolysis of the polymer for up to two years. Ageing temperatures ranged from 80°C to 140°C. Samples were characterized periodically in terms of both chemical structure at the macromolecular scale, using SEC, DSC, SASX and WAXS, and mechanical behaviour through tensile tests. Both degradation mechanisms lead to chain scission within the polymer, an increase in crystallinity ratio, a decrease in the amorphous layer thickness and an embrittlement of the polymer. First a decrease in the strain at break is observed while the maximal stress remains unchanged. Then a drop in maximal stress is identified. Using these experimental results, both the origin of the embrittlement and the factors governing embrittlement are discussed. The decrease in strain at break is attributed for the first time in polyamide to the decrease in concentration of tie molecules determined through a theoretical approach. The loss in entanglements is associated with the drop in maximal stress. Furthermore, it is shown that the crystallinity ratio does not govern the embrittlement of polyamide. However, both the molar mass and the amorphous layer thickness are faithful indicators of this embrittlement whatever the degradation mechanism.Lire moins >
Langue :
Anglais
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
Université de Lille
CNRS
INRAE
ENSCL
CNRS
INRAE
ENSCL
Collections :
Équipe(s) de recherche :
Ingénierie des Systèmes Polymères
Date de dépôt :
2024-01-10T15:20:33Z
2024-01-26T12:35:09Z
2024-01-26T12:35:09Z
Fichiers
- Deshoulles et al. - 2021 - Origin of embrittlement in Polyamide 6 induced by .pdf
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