ATRP of Styrene and Methyl Methacrylate with Less Efficient Catalysts and with Alkyl Pseudohalides as Initiators/Chain Transfer Agents

✍ Scribed by Yungwan Kwak; Yuichi Yamamura; Krzysztof Matyjaszewski

• Book ID: 102488697
• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 280 KB
• Volume: 211
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200900509

✦ Synopsis

Abstract

Ligands, such as Me~4~cyclam and anionically charged BPAA, providing low values of k~da~ and less efficient for ATRP with alkyl halides, were successfully used for ATRP in the presence of alkyl pseudohalides as initiators/chain transfer agents, resulting in well‐controlled PSt and PMMA. Although the catalysts with these ligands provide a poor control for ATRP with alkyl halides as initiators, the pseudohalides such as dithioesters yield well‐controlled concurrent ATRP/RAFT. The propagating radicals were generated directly from the CTA in the absence of conventional radical initiators, such as AIBN, that are required for a conventional RAFT polymerization. This system is an example of the synergetic cooperation between ATRP and RAFT polymerization procedures that suppresses new chain generation by direct activation of CTA with a copper complex to supply radicals and utilizes fast chain transfer reactions to provide control of the polymerization.

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