Based on the impact strength and the tensile elongation
at break, the most appropriate PLA/CSR composition
was selected among those prepared in section 2.2. Then it
was dry-blended and melt-mixed with rubber wood
sawdust ranging from 5 wt% to 30 wt% using identical
conditions and processing equipment as described in
section 2.2. The properties of the unmodified PLA/rubber
wood sawdust were also investigated to compare its
toughness with those modified with CSR. All the formulations
for the PLA/rubber wood and the
PLA/CSR/rubber wood composites are listed in Table 1.