Article Dans Une Revue Industrial Crops and Products Année : 2023

Exploiting synchrotron X-ray tomography for a novel insight into flax-fibre defects ultrastructure

Lola Pinsard
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Elouan Guillou
Marina Fazzini
Emmanuel de Luycker
Jonathan Perrin
Timm Weitkamp
Pierre Ouagne

Résumé

Flax fibres are valuable reinforcements for tomorrow's composites. However, defects called kink-bands, which mainly appear on fibres during the extraction and transformation phases, might affect their mechanical properties. Defects induced pores within the kink-band are investigated in this work. They were morphologically explored using synchrotron phase-contrast X-ray microtomography, a technique that displays a sharp 3D representation of the pores. The study highlights the link between kink-bands and secondary cell wall ultrastructure. Pores are organised concentrically around the lumen, and their low thickness suggest that they are located at the interface between cellulose layers within S2 (G) layer. Moreover, the pores inclination with reference to the lumen axis follows the typical microfibrillar angle changes observed in the literature in the kink-band region. The volumes of the pores were measured, and a local increase in porosity was revealed in zones where defects are most severe along the fibre.

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hal-04125820 , version 1 (13-06-2023)

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Delphine Quereilhac, Lola Pinsard, Elouan Guillou, Marina Fazzini, Emmanuel de Luycker, et al.. Exploiting synchrotron X-ray tomography for a novel insight into flax-fibre defects ultrastructure. Industrial Crops and Products, 2023, 198, pp.116655. ⟨10.1016/j.indcrop.2023.116655⟩. ⟨hal-04125820⟩
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