Biomimetic Polysaccharide Nanocomposites of High Cellulose Content and High Toughness

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Abstract
Plant cell walls combine mechanical stiffness, strength and toughness despite a highly hydrated state. Inspired by this, a nanostructured cellulose network is combined with an almost viscous polysaccharide matrix in the form of a 50/50 amylopectin−glycerol blend. Homogeneous films with a microfibrillated cellulose (MFC) nanofiber content in the range of 10−70 wt % are successfully cast. Characterization is carried out by dynamic mechanical analysis, field-emission scanning electron microscopy, X-ray diffraction, and mercury density measurements. The MFC is well dispersed and predominantly oriented random-in-the-plane. High tensile strength is combined with high modulus and very high work of fracture in the nanocomposite with 70 wt % MFC. The reasons for this interesting combination of properties include nanofiber and matrix properties, favorable nanofiber−matrix interaction, good dispersion, and the ability of the MFC network to maintain its integrity to a strain of at least 8%.