Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 6, Pages 1924-1928Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201410858
Keywords
block copolymers; cationic polymerization; living polymerization; organocatalysis; RAFT polymerization
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Funding
- Japan Society of Science [26248032]
- Program for Leading Graduate Schools Integrative Graduate Education and Research Program in Green Natural Sciences
- Grants-in-Aid for Scientific Research [26248032] Funding Source: KAKEN
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A metal-free, cationic, reversible addition-fragmentation chain-transfer (RAFT) polymerization was proposed and realized. A series of thiocarbonylthio compounds were used in the presence of a small amount of triflic acid for isobutyl vinyl ether to give polymers with controlled molecular weight of up to 1x10(5) and narrow molecular-weight distributions (M-w/M-n<1.1). This living or controlled cationic polymerization is applicable to various electron-rich monomers including vinyl ethers, p-methoxystyrene, and even p-hydroxystyrene that possesses an unprotected phenol group. A transformation from cationic to radical RAFT polymerization enables the synthesis of block copolymers between cationically and radically polymerizable monomers, such as vinyl ether and vinyl acetate or methyl acrylate.
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