تفاعل #2357

معادلة التفاعل

ε-caprolactone

p-dioxanone

propylene glycol

stannous octoate

→

ε-CAPROLACTONE p-DIOXANONE

المذيبات

toluene

ظروف التفاعل

المعالجة

1. 1
   أخرىA flame dried
2. 2
   أخرىThe flask was fitted with a flame
3. 3
   أخرىdried mechanical stirrer
4. 4
   أخرىThe flask was purged with nitrogen three times
5. 5
   درجة الحرارةmaintained at this temperature for about 24 hours
6. 6
   أخرىbath temperature was lowered to 110° C.
7. 7
   درجة الحرارةmaintained at this temperature for 24 hours
8. 8
   أخرىThe copolymer was dried under vacuum (0.1 mm Hg) at 80° C. for about 32 hours
9. 9
   أخرىto remove any unreacted monomer
10. 10
    أخرىat 25° C
11. 11
    أخرىat room temperature

الإجراء التجريبي

A flame dried, 250 mL, round bottom single neck flask was charged with 57.1 g (0.50 mole) of ε-caprolactone, 51.0 grams (0.50 mole) of p-dioxanone, 3.7 mL (50 mmol) of propylene glycol (USP), and 0.12 mL (34 μmol) of a 0.33M stannous octoate solution in toluene. The flask was fitted with a flame dried mechanical stirrer. The flask was purged with nitrogen three times before venting with nitrogen. The reaction mixture was heated to 140° C. and maintained at this temperature for about 24 hours and then bath temperature was lowered to 110° C. and maintained at this temperature for 24 hours. The copolymer was dried under vacuum (0.1 mm Hg) at 80° C. for about 32 hours to remove any unreacted monomer. The copolymer had an inherent viscosity of 0.22 dL/g in HFIP at 25° C. The copolymer was a liquid at room temperature. The molar ratio of PCL/PDS was found to be 52.4/47.6 by proton NMR.

المصدر