Masami Kamigaito 교수

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal-Catalyzed Living Radical PolymerizationMasami Kamigaito, Tsuyoshi Ando, and Mitsuo SawamotoView Author Information Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan Cite this: Chem. Rev. 2001, 101, 12, 3689–3746Publication Date (Web):December 12, 2001Publication History Received14 July 2001Published online12 December 2001Published inissue 1 December 2001https://pubs.acs.org/doi/10.1021/cr9901

Recent developments in polymerization reactions utilizing thiocarbonylthio compounds have highlighted the surprising versatility of these unique molecules. The increasing popularity of reversible addition-fragmentation chain transfer (RAFT) radical polymerization as a means of producing well-defined, 'controlled' synthetic polymers is largely due to its simplicity of implementation and the availability of a wide range of compatible reagents. However, novel modes of thiocarbonylthio activation ca

The development of advanced materials based on well-defined polymeric architectures is proving to be a highly prosperous research direction across both industry and academia. Controlled radical polymerization techniques are receiving unprecedented attention, with reversible-deactivation chain growth procedures now routinely leveraged to prepare exquisitely precise polymer products. Reversible addition-fragmentation chain transfer (RAFT) polymerization is a powerful protocol within this domain, w

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiving cationic polymerization of isobutyl vinyl ether by hydrogen chloride/Lewis acid initiating systems in the presence of salts: in-situ direct NMR analysis of the growing speciesMasami Kamigaito, Yoshihiro Maeda, Mitsuo Sawamoto, and Toshinobu HigashimuraCite this: Macromolecules 1993, 26, 7, 1643–1649Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1993https://pubs.acs.org/doi/10.1021/ma

Control of radical polymerization has been one of the most challenging frontiers in polymerization chemistry. This review presents the discovery of metal-catalyzed living radical polymerization and recent developments in the evolution of catalysts in terms of versatility and activity, scope of monomers, controlled polymerization in water, catalyst removal, and precision synthesis of well-controlled polymers such as random, block, end-functionalized, and star polymers.

This perspective article reviews the recent developments in stereoregulation in living radical polymerization of various polar vinyl monomers including methacrylates, acrylamides, vinyl esters, and vinyl amides. The stereoregulation should rely on an added Lewis acid, a polar solvent, or a multiple hydrogen-bonding additive, which can interact with the polar groups around the growing polymer terminal and/or of the monomer to induce the stereospecific chain growth, while the living or controlled

Naturally-occurring terpenes, such as (−)-β-pinene and (−)-α-phellandrene, were cationically polymerized and subsequently hydrogenated into stable alicyclic hydrocarbon polymers with a rigid backbone. In contrast to the already known poly(terpenes), the hydrogenated poly(β-pinene) with a high molecular weight (Mw > 50 000) showed a high glass transition temperature (Tg = 130 °C) and degradation temperature (10% loss at > 400 °C), suggesting new promising biomass-derived materials for practical u

Bio-based polymer materials from renewable resources have recently become a growing research focus. Herein, a novel thermoplastic elastomer is developed via controlled/living radical polymerization of plant-derived itaconic acid derivatives, which are some of the most abundant renewable acrylic monomers obtained via the fermentation of starch. The reversible addition-fragmentation chain-transfer (RAFT) polymerizations of itaconic acid imides, such as N-phenylitaconimide and N-(p-tolyl)itaconimid

The polymerization of vinyl monomers generally requires the selection of an appropriate single intermediate, whereas in copolymerization, the selection of the comonomer is limited by the intermediate. Herein, we propose interconvertible dual active species that can connect comonomers through different mechanisms to produce specific comonomer sequences in a single polymer chain. More specifically, two different stimuli, that is, a radical initiator and a Lewis acid, are used to activate the commo

A new ruthenium complex with an electron-donating aminoindenyl ligand induces a fast living radical polymerization of methyl methacrylate (MMA) in the presence of a chloride initiator to give polymers with controlled and variable molecular weights (Mn = 103-105) and very narrow molecular weight distributions (Mw/Mn < 1.1). The structure and high activity of the catalyst were analyzed by X-ray crystallography and cyclic voltammetry in comparison to those of a similar complex with an indenyl ligan

(−)-β-Pinene, a major constituent of pine tree oil, was cationically polymerized to generate a high-molecular-weight polymer and then subsequently hydrogenated via metal catalysts to give a high-performance, bio-based cycloolefin polymer with an alicyclic backbone. To obtain the high-molecular-weight polymer, the controlled/living cationic polymerization of (−)-β-pinene was investigated by an initiating system, consisting of a protonic acid, a Lewis acid, and an added base, along with an increme