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Prediction of stress induced by heterogeneous oxidation: Case of epoxy/amine networks

Type
Articles dans des revues avec comité de lecture
Auteur
ERNAULT, Esteve
86289 Procédés et Ingénierie en Mécanique et Matériaux [Paris] [PIMM]
DIRRENBERGER, Justin
86289 Procédés et Ingénierie en Mécanique et Matériaux [Paris] [PIMM]
RICHAUD, Emmanuel
86289 Procédés et Ingénierie en Mécanique et Matériaux [Paris] [PIMM]
FAYOLLE, Bruno
86289 Procédés et Ingénierie en Mécanique et Matériaux [Paris] [PIMM]

URI
http://hdl.handle.net/10985/14775
DOI
10.1016/j.polymdegradstab.2019.02.019
Date
2019
Journal
Polymer Degradation and Stability

Résumé

A methodology to predict the formation of superficial stress during the diffusion-limited oxidation of thick epoxy/amine samples is proposed. This quantitative methodology is based on the understanding of mechanisms responsible for this stress lead to superficial micro-cracks. The first step consists of simulating the homogeneous oxidation on the surface of thick samples. The extent of oxidation is assessed through the concentration of oxidation products as amide groups measured using Fourier-transform infrared spectroscopy (FTIR). These experimental results are compared to simulations obtained from a kinetic model based on a close loop mechanistic scheme in chain oxidation. Shrinkage and tensile behavior changes are correlated with an oxidation tracer, being amide groups in our case. The second step considers diffusion-limited oxidation in thick samples where the gradients of oxidation products characterized through thickness by micro-FTIR are simulated by coupling the previous kinetic model with oxygen diffusion. Finally, the gradient of strain and stress induced by oxidation of a thick epoxy/amine sample is simulated by inserting the mechanical behavior modifications and shrinkage gradient associated with the amide gradient in finite element code (Abaqus®). As a result, it is shown that it is possible to predict the superficial stress level as a function time/temperature of exposure and sample geometry.

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PIMM-PDST-Ernault-2019.pdf
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Fin d'embargo:
2019-10-01
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Documents liés

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  • Prediction of stress induced by heterogeneous oxidation: Case of epoxy/amine networks 
    ERNAULT, ESTEVE; DIRRENBERGER, JUSTIN; RICHAUD, EMMANUEL; FAYOLLE, BRUNO (elsevier, 2019)
    A methodology to predict the formation of superficial stress during the diffusion-limited oxidation of thick epoxy/amine samples is proposed. This quantitative methodology is based on the understanding of mechanisms ...
  • Thermal oxidation of epoxies: Influence of diamine hardener 
    ERNAULT, Esteve; RICHAUD, Emmanuel; FAYOLLE, Bruno (Elsevier, 2016)
    This work reports the thermal oxidation of DGEBA resins totally cured with cycloaliphatic (isophorone diamine) or with linear aliphatic (trioxa-tridecanediamine or TTDA) diamine hardener. Chemical changes (carbonyl build-up) ...
  • Thermal-oxidation of epoxy/amine followed by glass transition temperature changes 
    ERNAULT, Esteve; RICHAUD, Emmanuel; FAYOLLE, Bruno (Elsevier, 2017)
    Thermal oxidation of three epoxy resins differing by the nature of prepolymer (bisphenol A diglycidyl ether and 1,4-butanediol diglycidyl ether) and hardener (isophorone diamine and 4,7,10-Trioxa-1,13-tridecanediamine) was ...
  • Origin of epoxies embrittlement during oxidative ageing 
    ERNAULT, Esteve; RICHAUD, Emmanuel; FAYOLLE, Bruno (Elsevier, 2017)
    Thermal oxidation of three epoxy resins prepared from flexible or rigid prepolymers and hardeners was studied by monitoring epoxy mechanical and physical changes. The physical changes were followed by mass measurements, ...
  • New insights in polymer-biofuels interaction Avancées dans la compréhension des interactions polymères-biocarburants 
    RICHAUD, Emmanuel; DJOUANI, Fatma; FAYOLLE, Bruno; VERDU, Jacques; FLACONNECHE, Bruno (Institut Français du Pétrole, 2015)
    This paper deals with polymer-fuel interaction focusing on specific effects of biofuels on polyethylene (PE) in automotive applications. The practical objective is to develop a predictable approach for durability of ...

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