تفاعل #1829954

معادلة التفاعل

Glycolide

Trimethylene carbonate

stannous octoate

l-Lactide

→

l-LACTIDE GLYCOLIDE TRIMETHYLENE CARBONATE

المذيبات

diethylene glycol

ظروف التفاعل

المعالجة

1. 1
   workup.ADDITIONThe mixture was charged into a nitrogen
2. 2
   أخرىpurged
3. 3
   workup.STIRRINGThe contents were stirred at this temperature for 25 minutes, at which point the mixture
4. 4
   أخرىhad obtained maximum
5. 5
   workup.ADDITIONcharged into the reactor
6. 6
   workup.STIRRINGThe contents were stirred at 200° C. for 2 hours at which point the mixture
7. 7
   أخرىdried in a vacuum oven at 100° C.
8. 8
   أخرىmeasured at 30° C. on a 0.5% solution

الإجراء التجريبي

Trimethylene carbonate (TMC, 34.0 grams), diethylene glycol (DEG, 17.7 mg) and stannous octoate (20.2 mg) were combined and melted under a nitrogen atmosphere. The mixture was charged into a nitrogen purged stirred reactor at 200° C. The contents were stirred at this temperature for 25 minutes, at which point the mixture had obtained maximum melt viscosity. l-Lactide (l-Lac, 168.7 grams) and Glycolide (Gly, 18.7 grams) were melted and charged into the reactor. The contents were stirred at 200° C. for 2 hours at which point the mixture had again obtained maximum melt viscosity. The polymer was discharged from the reactor, ground, and dried in a vacuum oven at 100° C. and 0.2 mm Hg. The polymer had an inherent viscosity of 1.31 dl/g in chloroform, measured at 30° C. on a 0.5% solution. The polymer composition, as measured by 1H-NMR spectroscopy was 15.9/75.1/9.0 weight percent TMC/l-LAC/Gly.

المصدر