期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 33, 期 9, 页码 842-847出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201200096
关键词
block copolymers; chain-growth polymerization; conjugated polymers; palladium catalysts
资金
- National Science Foundation [CHE-0954610]
- Alfred P. Sloan Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0954610] Funding Source: National Science Foundation
An N-heterocyclic carbene-ligated palladium catalyst was discovered to mediate living, chain-growth polymerizations of both phenylene- and thiophene-based monomers. Polymerization of a fluorene-based monomer, on the other hand, did not proceed through a living, chain-growth pathway. Excitingly, block copolymerizations of phenylene and thiophene proceeded via a chain-growth pathway, regardless of the order of monomer addition. Although some chain termination was observed during these copolymerizations, this pathway could be minimized when the second monomer was added shortly after consumption of the first monomer. These results suggest that the catalyst resting-state at the end of polymerization is unstable. As a result, modifications to the NHC-scaffold or the 3-chloropyridine ligand will be necessary to generate an improved catalyst.
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