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ATRP of Styrene and Methyl Methacrylate with Less Efficient Catalysts and with Alkyl Pseudohalides as Initiators/Chain Transfer Agents
Author(s) -
Kwak Yungwan,
Yamamura Yuichi,
Matyjaszewski Krzysztof
Publication year - 2010
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200900509
Subject(s) - chain transfer , polymer chemistry , chemistry , raft , alkyl , reversible addition−fragmentation chain transfer polymerization , catalytic chain transfer , methyl methacrylate , polymerization , styrene , atom transfer radical polymerization , radical polymerization , organic chemistry , copolymer , polymer
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.