those caused by the CNF in the nanocomposites. The filler concentration was chosen as 10 wt.% for several reasons: enough to induce measurable changes in the polymer properties and higher density of cellulose relative to polymer. The CNF–PHB mixtures, PHB, and PLA were dried to a moisture content of less than 1%. The moisture information obtained according to ASTM D5229M-14. The matrix polymer, PLA, was mixed with the CNF, PHB, and CNF–PHB
mixtures. The compounding was conducted with a Brabender Prepmixer® equipped with a bowl mixer. The temperature was set to 190 ◦C and rotor speed at 60 rpm. CNF, PHB, and CNF–PHB mixtures were added to the mixer when the PLA melt appeared well mixed. Mixing was done for 15 min. until the torque stabilized. The PLA and
composite compounds were granulated using a lab-scale grinder. The ground particles were dried in an oven at 105 ◦C for 16 h before being injection molded into American Society of Testing and Materials (ASTM) test specimens. All materials were injection molded using a barrel temperature of 200 ◦C, a mold temperature of 200 ◦C,and an injection pressure of 2500 psi.