Exploring the microstructure of natural fibre composites by confocal Raman imaging and image analysis
Gallos, Antoine | Paës, Gabriel | Legland, David | Allais, Florent | Beaugrand, Johnny | Fractionnement des AgroRessources et Environnement (FARE) ; Université de Reims Champagne-Ardenne (URCA)-Institut National de la Recherche Agronomique (INRA) | Agro-Biotechnologies Industrielles (ABI) ; AgroParisTech | Unité de recherche sur les Biopolymères, Interactions Assemblages (BIA) ; Institut National de la Recherche Agronomique (INRA) | Génie et Microbiologie des Procédés Alimentaires (GMPA) ; Institut National de la Recherche Agronomique (INRA)-AgroParisTech | Fondation de France site Paris-Reims
We describe a combination of Confocal Raman Imaging (CRI) and quantitative image analysis to characterise biocomposite material microstructures. Both techniques offer lateral resolutions close to 1.3 ism and axial resolution of 13 gm, while simplifying sample preparation to hand-cutting without any surface preparation. Extruded and injected polycaprolactoneihemp fibre composites were used as demonstration biocomposites. A green macrobisphenol additive (bis-O-dihydroferuloy1-1,4-butanediol) was also used as a chemical probe to characterise the dispersion efficiency of additives, with a detection threshold of 2.3 wt% above which very local heterogeneity can be determined by this technique. CRI provided microstructure information for the entire binary structure formed by the fibre network. The fibre dispersion and orientation depend on their location in the matrix, and the specific surface of the fibres increases with the fibre content as aggregates start to develop. The technique also highlighted a possible core-skin effect in the injected composite.
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