We produce polyesters including polylactide, poly(lactide-co-glycolic acid), poly(ε-caprolactone), and poly(trimethylene carbonate), i.e. PLA( PLLA, PDLA, PDLLA), PLGA(PDLLGA, PLLGA), PCL, PTMC with different funtional groups (hydroxyl, carboxylic acid, ester).