Table 2 shows the impact results of epoxy/silica-P(CL-mLA)-
COOH nanocomposites. It is quite clear that nanosilicas modified
with soft P(CL-mLA) chains improve the impact strength of epoxy.
The impact strength of epoxy is improved from 33.49 kJ/m2 to
46.68 kJ/m2, an increment of 39.4% with only 2wt% loading of
nanofillers. The actual nanosilica content is only about 0.2wt% as
the weight percentage of nanosilica in the modified silica-P(CLmLA)-
COOH is about 10wt%. The fracture toughness of epoxy also
shows an increase with the addition of silica-P(CL-mLA)-COOH
nanoparticles (Table 2).