The superior mechanical properties of TPS/BC composites compared with those filled with VC fibers, confirmed the good interfacial adhesion and the strong interactions between the BC and the TPS matrix. These results can be explained by the inherent morphology of BC with its nano- and micro-fibrillar network. Furthermore, huge increments in the mechanical performance of several composite materials have previously been reported by the incorporation of modest proportions of BC nanofibers in other kinds of matrices [24].