Abstract: This review focused on the recent research progress in the modification of poly(lactic acid). The modification methods included direct polycondensation method, ring-opening polymerization, and chain-extending method. The molecular weight of poly(lactic acid) copolymers obtained by ring-opening polymerization was higher than that by direct polycondensation method. The chain-extending method could be used together with others. The application of modified poly(lactic acid) was reviewed, particularly in medical and packaging area.

Key words: packaging material, poly(lactic acid), copolymerization, modification