poly-DLlactide acid

Polylactide (Poly(lactic acid), PLA) is polymer obtained by the ring-opening polymerization of lactide (cyclic dimer of lactic acid) as monomer. Since lactide has 3 optical isomer as L-lactide, D-lactide, and DL-lactide, the polymers obtained from L-lactide, D-lactide, and DL-lactide are abbreviated to PLLA, PDLA, and PDLLA, respectively. The chemical properties of L-lactide and D-lactide are the same while their steric structures are different, PLLA polymer and PDLA polymer have the same characteristics. On the other hand, PDLLA polymer has sterically different structure with PLLA and PDLA polymers, so that the polymer shows the different characteristics with those polymers.