The modulus
of the rather hard and brittle PLA dropped from 2.75 GPa to
2.00 GPa, corresponding to a drop in the tensile strength from 61.22
to 48.98 MPa when the ultrafine acrylate rubber was added by
10 wt%. As the content of the soft and elastic acrylate rubber loading
increased, thereby increasing the interfacial area between the PLA
and the elastic acrylate rubber, the tensile strength was reduced.