Preparation of biodegradable poly(lactic acid-co-aspartic acid) by copolymerization processes

Poly(lactic acid-co-aspartic acid) was obtained by copolymerizing DL-lactic acid and L-aspartic acid. The structure of poly(lactic acid-co-aspartic acid) was characterized by IR, 1H NMR. The characters of poly(lactic acid-co-aspartic acid) were determined by hydrolytic degradable experiments, which indicate that the degradation rate of poly(lactic acid-co-aspartic acid) was accelerated by aspartic acid synthesized in the polymers.