Reaktion #323403

ord-769478c61fac4769bad876e5c34cdc48

Reaktionsgleichung

C[C@@H]1OC(=O)[C@H](C)OC1=O
L-(-)-lactide
O=C1CCCCCO1
epsilon caprolactone
CCCCC(CC)C(=O)[O-].CCCCC(CC)C(=O)[O-].[Sn+2]
stannous octoate
→
C[C@@H]1OC(=O)[C@H](C)OC1=O.O=C1CCCCCO1
L-(-)-lactide epsilon caprolactone

Edukte

C[C@@H]1OC(=O)[C@H](C)OC1=O
L-(-)-lactide
O=C1CCCCCO1
epsilon caprolactone
CCCCC(CC)C(=O)[O-].CCCCC(CC)C(=O)[O-].[Sn+2]
stannous octoate

Reagenzien

Keine

Reaktionsbedingungen

Detaillierte Bedingungen
See reaction.notes.procedure_details.

Aufarbeitung

  1. 1
    Sonstigeare placed in a glass flask
  2. 2
    Temperaturheated for 45 hours at 140° to 142° C
  3. 3
    Sonstigewith a melting point endo-therm of 42° C.

Vorschrift

The procedure of Example II is repeated except that 20 grams of L-(-)-lactide, 30 grams of epsilon caprolactone and 0.0105 grams of pure stannous octoate are placed in a glass flask, blanketed with nitrogen, and heated for 45 hours at 140° to 142° C. The copolymer is tough and elastic and has good tensile strength and elongation properties. The copolymer has a GPC molecular weight of Mw =323,000 and Mn =180,000. DSC of the copolymer reveals a moderate amount of crystallinity with a melting point endo-therm of 42° C. and a glass transition temperature of -16° C. Physical properties of the polymer are shown in Table 1.

Quelle

DOI: 10.6084/m9.figshare.5104873.v1Patent: US04643734uspto-grants-1987_02