ALIPHATIC POLYCARBONATE QUENCH METHOD
First Claim
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1. A method comprising:
- initiating an aliphatic polycarbonate polymerization reaction by combining an epoxide with carbon dioxide in the presence of a catalytic transition metal-ligand complex to form a reaction mixture comprising a polycarbonate chain; and
quenching the polymerization reaction by contacting the reaction mixture with an acid containing an anion that is not a polymerization initiator.
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Abstract
The present disclosure is directed to, in part, an aliphatic polycarbonate polymerization reaction initiated by combining an epoxide with carbon dioxide in the presence of a catalytic transition metal-ligand complex to form a reaction mixture, and further quenching that polymerization reaction by contacting the reaction mixture with an acid containing a non-nucleophilic anion produces a crude polymer solution with improved stability and processability.
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Citations
56 Claims
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1. A method comprising:
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initiating an aliphatic polycarbonate polymerization reaction by combining an epoxide with carbon dioxide in the presence of a catalytic transition metal-ligand complex to form a reaction mixture comprising a polycarbonate chain; and quenching the polymerization reaction by contacting the reaction mixture with an acid containing an anion that is not a polymerization initiator. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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2. A method comprising:
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initiating an aliphatic polycarbonate polymerization reaction by combining an epoxide with carbon dioxide in the presence of a catalytic transition metal-ligand complex to form a reaction mixture comprising a polycarbonate chain; and quenching the polymerization reaction by adding to the reaction mixture a chain transfer agent and a ligand, wherein;
the added ligand is not a polymerization initiator, and the added ligand has a higher affinity for the transition metal of the transition metal-ligand complex than does the polycarbonate chain, or the added chain transfer agent.
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Specification