Cationic RAFT Polymerization Using ppm Concentrations of Organic Acid |
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| Authors: | Mineto Uchiyama Prof Dr Kotaro Satoh Prof Dr Masami Kamigaito |
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| Institution: | 1. Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo‐cho, Chikusa‐ku, Nagoya 464‐8603 (Japan);2. Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, 4‐1‐8 Honcho, Kawaguchi, Saitama 332‐0012 (Japan) |
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| Abstract: | 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 1×105 and narrow molecular‐weight distributions (Mw/Mn<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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| Keywords: | block copolymers cationic polymerization living polymerization organocatalysis RAFT polymerization |
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