Amide Functional Initiators for Transition-Metal-Mediated Living Radical Polymerization

Autor:	David M. Haddleton, Adam Limer
Rok vydání:	2006
Předmět:	chemistry.chemical_classification Polymers and Plastics Chemistry Organic Chemistry Radical polymerization Dispersity Solution polymerization Polymer Inorganic Chemistry Polymerization Polymer chemistry Materials Chemistry Copolymer Copper bromide Copper chloride
Zdroj:	Macromolecules. 39:1353-1358
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma051443w
Popis:	Amide initiators were used successfully for copper-mediated living radical polymerization (often called ATRP) of a range of methacrylates to narrow molecular weight homopoymers and block copolymers from initiator species containing a bromo-2-methylpropionamide. The polymerization of methyl methacrylate (MMA) occurs efficiently with a copper chloride (Cu(I)Cl)/N-n-octyl-2-pyridylmethanimine catalyst by maintaining a relatively low temperature for initiation and slowly increasing to the reaction temperature. By keeping the reaction at 25 °C for 30 min before heating to 90 °C, a number-average molecular weight (Mn) of 12 900 g mol-1 and a polydispersity of (PDI) = 1.24 at 70% conversion (where [MMA]/[initiator] = 100) were obtained. The polymers produced showed molecular weights in good agreement with the theoretical and polydispersities of 1.20. Where the reaction was heated to 90 °C, immediately high mass was obtained (26 600 g mol-1) in low yield (33%). When copper bromide (Cu(I)Br) was used in place of C...
Databáze:	OpenAIRE
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