Fig. 4, neat PLA and the 2.5 wt.% BC/PLA samples show yielding behaviour in the
stress-strain curve. However, the strain of the samples containing
5 wt%, 7.5 wt% and 10 wt% BC particles localized beyond the
maximum stress, led to the composite fracture immediately as a
quasi-brittle behaviour under tensile deformation [5,48,49].
Increasing the content of BC particle produced a sample that becomes
progressively less plasticity and more resistant to deformation.
It can be concluded that the elongations of BC/PLA
composites decreased as the BC particles reduced the ductility of
the PLA.