Abstract
One of the main assets in bio-based composites is the ability to understand and characterise the surface and bonding properties of this kind of fibres with polymer resins. The first issue is that natural fibres often have a hydrophilic behaviour, making them difficult to wet by mostly hydrophobic resins. This tends to generate manufacturing issues such as voids in the final part. This also tends to induce issues at the interface between fibres and resins. This problem is partially solved by the morphology of natural fibres that provides additional mechanical bonding compared to synthetic cylindrical fibres. One last issue that has to be considered is that natural fibres are multilayered. The interfaces between layers are also to be characterized to predict mechanical behaviour of bio-based composites.
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