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, wherein the catalytic transition metal-ligand complex comprises at least one ligand that is a polymerization initiator and at least one ligand that is not a polymerization initiator; and
quenching the polymerization reaction by contacting the reaction mixture with an acid containing an anion that is not a polymerization initiator, wherein less than 10 equivalents of the acid containing an anion that is not a polymerization initiator are added to the reaction mixture relative to the amount of catalytic transition metal-ligand complex present in the reaction mixture.
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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
53 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, wherein the catalytic transition metal-ligand complex comprises at least one ligand that is a polymerization initiator and at least one ligand that is not a polymerization initiator; and quenching the polymerization reaction by contacting the reaction mixture with an acid containing an anion that is not a polymerization initiator, wherein less than 10 equivalents of the acid containing an anion that is not a polymerization initiator are added to the reaction mixture relative to the amount of catalytic transition metal-ligand complex present in the reaction mixture. - View Dependent Claims (2, 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)
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Specification