Effect of 9,9′-Bis(aryl)fluorene-modified Nanocellulose, Bamboo, and Bagasse Fibers on Mechanical Properties of Various Polymer Composites2025 · Impact-resistant automotive componentswere studiedby evaluating the effects of single-screw and twin-screw extrusion on the mechanical properties of composites made from fluorene-modified nanocellulose (FCF) or bamboo fibers (30 wt%) combined with various polymers. Natural fiber composites were injection molded, and their mechanical properties were evaluated.Results showed that fluorene-modified nanocellulose exhibited improved dispersion when kneaded with polycarbonateand polyamide 6 using twin-screw extrusion, resulting in increases of over 5000 MPa in flexural modulus and over 40 MPa in maximum flexural stress compared to the base polymer. However, composites made with polyamide 66and bamboo fibers required high injection molding temperatures exceeding 260°C, which led to thermal degradation and reduced the fiber reinforcement effect on mechanical properties.The polypropyleneshowed weak interfacial compatibility with bamboo fibers, resulting in limited reinforcement effectsin both single and twin-screw extrusion. The brittleness of the fibers didnot significantly influence the elongation of the PP composite.Nonetheless, it exhibited less reduction in elongation compared to composites where bamboo or FCF was added to other polymers. Building on these results, flexuraltests wereconducted on composites combining high-impact polypropylenewith naturalfibers, demonstrating the potential for high-impact-resistant composite materials suitable for automotive applications
