Origin of embrittlement in Polyamide 6 ...
Document type :
Article dans une revue scientifique
Permalink :
Title :
Origin of embrittlement in Polyamide 6 induced by chemical degradations: mechanisms and governing factors
Author(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]
Journal title :
Polymer Degradation and Stability
Abbreviated title :
Polymer Degradation and Stability
Pages :
109657
Publisher :
Elsevier BV
Publication date :
2021-09
ISSN :
0141-3910
HAL domain(s) :
Chimie/Matériaux
English abstract : [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 ...
Show more >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.Show less >
Show more >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.Show less >
Language :
Anglais
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
CNRS
INRAE
ENSCL
CNRS
INRAE
ENSCL
Collections :
Research team(s) :
Ingénierie des Systèmes Polymères
Submission date :
2024-01-10T15:20:33Z
2024-01-26T12:35:09Z
2024-01-26T12:35:09Z
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