Biocomposite films based on a polyvinyl alcohol (PVA) with the addition of cellulose nanofibrils (CNF) as a reinforcing component and with the addition of the biologically active tannic acid (TA) were prepared. The influence of different additions of CNF and TA in the polymer matrix PVA on the mechanical properties, improvement of hydrophobicity of the prepared films was studied. In all cases, the addition of CNF and TA improved the value of tensile strength and elastic modulus. In one of the prepared films, the hydrophobicity of the film surface was greatly improved compared to the neat PVA film. The better properties of the produced composite films were probably due to hydrogen and ester bonds between the components of the composite, which was confirmed by FT-IR spectroscopy.

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