Résumé
As pointed out by George et al. (Polym Eng Sci 41(9):1471–1485, 2001), a clear understanding of the complex nature of surfaces in lignocellulosic substrates is needed to optimize modification procedures and thus to increase the usefulness of lignocellulosic biomass as a constituent of composite materials in technical applications. Surface chemistry and topographical features of the fibres are key parameters that influence chemical bonding and mechanical interlocking with polymer matrices, and hence govern the wetting and adhesion/adherence processes in natural fibre reinforced composites. This chapter proposes a comprehensive description of the different approaches used to characterize natural fibres modifications.