When an excess amount of MA (20%) is used, the anhydride content in the PLA-g-MAwas found to be 3.8%, because most of the MA (flash point 102 8C, mp¼52 8C) sublime during extrusion at 183 8C and vacuum drying at 130 8C for 24 h.
When anexcess amount of MA (20%) is used, the anhydride contentin the PLA-g-MAwas found to be 3.8%, because most of theMA (flash point 102 8C, mp¼52 8C) sublime during extrusionat 183 8C and vacuum drying at 130 8C for 24 h.