Addition of small amount of bioadimide is able to
reduce the viscosity within the low shear rate region which
indicated that the low energy is required to process the
materials. However, in the high shear rate region, the viscosity
of both bio-composites was found almost equal.
The melt flow behavior index (n) is another indicator to
investigate non-Newtonian character of polymer composites.
As shown in Table 3, with increasing shear rate the
melt flow index (n) was decreased which indicated that
the flow behavior of PLA and its bio-composites are
pseudoplastic nature. Generally, a smaller n value means
a stronger non-Newtonian character which corresponded
to greater shear thinning behavior (Awal and Sain, 2011).
PLA/WP/Bioadimide composites became lower
than that of PLA/WP composites when shear rate was
increased. It is noteworthy that the multifunctional bioadimide
played a vital to reduce the viscosity in the composite
system. Consequently, the processability of the biocomposites
was remarkably improved whereas without
bioadimide the processing of bio-composites was not
As shown in Table 3, PLA and wood fibers reinforced
bio-composites showed non-Newtonian character. Adding
bioadimide with this bio-composite was improved the processability.
The experimental results proved that the flow
behavior of bio-composites with bioadimide was increased
significantly compared to PLA/WP bio-composites. It is
noteworthy that the viscosity of bio-composites could be
adjusted either by controlling the shear rate or using bioadimide
in the multicomponent system.