Herein, we report a model investigation of the adhesion properties
between major polysaccharides present in flax fibre and polylactic
acid (PLA) polymer matrix, and a correlation between these
interactions and the final mechanical properties of the fibre and
the composite. The raw flax fibre was first submitted to two
separate treatments, an enzymatic and an alkali one, which are
known to indirectly promote the fibre-matrix interface adherence.
Morphology, mechanical and adherence properties of the treated
fibres were measured from nanometer to macroscopic scale. In a
second time, we adapt the colloidal force microscopy (CFM) to
directly probe the interaction forces between PLA and different
polysaccharides in the flax fibre. Our results underline the
important interactions of cellulose and PLA matrix with the
hydrated polymers, such as hemicelluloses and pectins that plays
crucial role in maintaining fibres intrinsic strength, as well as
interfacial properties respectively. In parallel, adhesion force
mapping of real raw and treated flax fibre's surface by AFM
force-volume technique give complementary results that underline an
important adhesion with the hydrated polysaccharides.
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