Reaction #93377

Reaction equation

lactic acid

glycolic acid

→

lactic acid glycolic acid

Conditions

Workup

1. 1
   Temperatureto heating under reduced pressure in nitrogen gas stream at 100° to 150° C./350 to 30 mmHg stepwise for 6 hours
2. 2
   Otherwith removing
3. 3
   workup.DISTILLATIONdistilled water
4. 4
   Otherthe resultant was subjected to a condensation reaction at 175° C./6 to 5 mmHg for 36 hours

Procedure

To 160 g (1.5 mol) of 85% lactic acid aqueous solution was added 38 g (0.5 mol) of glycolic acid and the mixture was subjected to heating under reduced pressure in nitrogen gas stream at 100° to 150° C./350 to 30 mmHg stepwise for 6 hours with removing distilled water, and then the resultant was subjected to a condensation reaction at 175° C./6 to 5 mmHg for 36 hours to give lactic acid-glycolic acid copolymer [monomer ratio: 75/25 (on a weight basis), average molecular weight: 14000, glass transition temperature: about 40 to 45° C⟧

Source