Radical Homopolymerization of Vinyl Ethers Activated by Li+-π Complexation in the Presence of CH3OLi and LiI

In this study, we develop a direct, thermally initiated radical homopolymerization of vinyl ethers mediated by lithium salts CH3OLi and LiI. In the case of vinyl ether monomers having a...

Ultrafast and green ionic liquid-mediated controlled cationic polymerization towards amphiphilic diblock copolymers

IL-mediated ultrafast ambient temperature living cationic polymerization of styrene (St), yielding well-defined PSt and polystyrene-b-poly(isobutyl vinyl ether) diblock copolymers with acceptable dispersity values (Đ ≤ 1.21) is reported.

Manganese carbonyl induced cationic reversible addition–fragmentation chain transfer (C-RAFT) polymerization under visible light

Vinyl ethers were polymerized by C-RAFT polymerization on the basis of halide abstraction reaction of manganese carbonyl and organic halide.

Controlled Radical Homopolymerization of Representative Cationically Polymerizable Vinyl Ethers

Facile direct radical homopolymerization of vinyl ethers without a hydroxy group was achieved up to near full conversion. This polymerization was conducted in water suspension in the presence of lithium hydroxide using a thermally triggered azo-initiator of dimethyl 2,2'-azobis(2-methylpropionate). In the polymerization system, appropriate hydrogen bonding and cation-π interactions under basic conditions are keys to the successful direct radical homopolymerization. The hydrogen bonding between water and vinyl ether oxygen reduces the reactivity of the growing radical, thus suppressing unfavorable side reactions such as β-scission. In addition, Li⁺ interacts with the oxygen and the vinyl group of vinyl ethers. The vinyl ether tends to be "activated" and the polymerization can be facilitated. Based on the results of free radical polymerization of vinyl ethers, controlled polymerization was also accomplished using the appropriate dithiocarbamate RAFT agent in view of the solubilities of the radical leaving group.

Visible light induced controlled cationic polymerization by in situ generated catalyst from manganese carbonyl

Controlled cationic polymerization of various vinyl ethers is achieved under light radiation, utilizing commercially available reagents, under mild conditions and the molecular weight distributions can be modulated by simply regulating the irradiation time.