Similar to the complex viscosity, steady shear viscosity of the PLA + PHB composite was lower than that of PLA attributed to the lower viscosity of PHB in Fig. 6. All the PLA composites as well as the matrix polymer exhibited Newtonian behavior at shear rates lower than 0.1 (1/s). Above 0.1 (1/s), viscosity decreased showing shear thinning behavior and pseudoplastic characteristics. Shear