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| Le Duigou, Antoine; Merotte, Justin; Bourmaud, Alain; Davies, Peter; Belhouli, Karim; Baley, Christophe. |
| The present article aims to investigate the contribution of hygroscopic expansion of flax fibres to interfacial radial stresses and Interfacial Shear Strength (IFSS) of Maleic Anhydride grafted PolyPropylene (MAPP)/Flax biocomposites. During manufacturing of thermoplastic biocomposites and storage at 50% RH, a weight variation is observed, attributed to water content evolution within plant cell-walls. The hygroscopic radial expansion coefficient βr flax of single flax fibres estimated by Environmental Scanning Electron Microscopy (ESEM) observation is many orders of magnitude higher (βf,R = 1.14 ε/Δm) than thermal expansion (αf, R = 78 10−6 ε/°C). Thus, its contribution to the development of residual stresses σrad during processing should be prevalent. A... |
| Tipo: Text |
Palavras-chave: Flax fibres; Fibre/matrix bond. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00397/50830/51594.pdf |
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| Le Duigou, Antoine; Davies, Peter; Baley, Christophe. |
| The influence of wet aging on the behaviour of flax/epoxy micro-composites composed of single flax fibres embedded in epoxy micro-droplets has been studied. Interfacial shear strength has been examined by debonding the micro-droplets. The apparent interfacial shear strength decreases with immersion time in water, dropping rapidly during the first 15 min of immersion then stabilizing. Drying samples after short immersion periods allows recovery of properties, indicating a plasticization mechanism. For longer immersion times irreversible degradation is observed. Scanning electron microscopy reveals fibre surface peeling, indicating that an internal interface within the fibre is weaker than the fibre/matrix interface after aging. A simple descriptive model... |
| Tipo: Text |
Palavras-chave: Flax fibres; Environmental degradation; Fibre/matrix bond. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00137/24829/23101.pdf |
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