Biodegradable copolyesteramide was synthesized from L-lactic acid oligomers and polyamide monomers to improve the properties of poly(lactic acid).The oligomer was synthesized from L-lactic acid using direct polycondensation process at 170 oC,
30 torr for 7 h. p-Toluenesulfonic acid used as a catalyst. From 1H NMR analysis the oligomers have degree of polymerization of
ca. 5. The L-lactic acid oligomer (OLLA) was subjected to reacted with