Results and discussion
The nanocomposites showed an increase in the storage modulus with increasing filler content; the largest increase was detected for the nanocomposite with the highest filler content, i.e. 15 vol%. Thus, the mechanical characteristics were successfully improved by the introduction of CNC into the polypropylene matrix while only using reinforcement originating from renewable sources. As expected, the viscosity increased with growing filler content – by a maximum of 30 % when determined at
185 °C, as the representative 3D printing temperature of polypropylene. Nevertheless, this nanocomposite retained its printability, as proved by several executed prints of the novel material.