Author
Takayuki Otsu
Bio: Takayuki Otsu is an academic researcher from Osaka City University. The author has contributed to research in topics: Polymerization & Radical polymerization. The author has an hindex of 38, co-authored 429 publications receiving 7055 citations.
Papers published on a yearly basis
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647 citations
367 citations
TL;DR: In this paper, l'influence des substituants sur les rapports de reactivite dans la copolymerisation radicalaire avec le styrene et le methacrylate de methyle est etudiee.
Abstract: Etude de l'influence de la position, du nombre et de l'encombrement sterique des substituants du phenyl sur la reactivite des monomeres. Les polymeres obtenus sont solubles dans les solvants organiques usuels (CHCl 3 , THF, benzene) et commencent a se decomposer vers 370 o C sous azote. L'influence des substituants sur les rapports de reactivite dans la copolymerisation radicalaire avec le styrene et le methacrylate de methyle est etudiee
202 citations
TL;DR: In this article, photoiniferters bearing an N,N-diethyldithiocarbamate group were used for the radical polymerization of styrene, methyl methacrylate, methyl acrylate and vinyl acetate.
142 citations
TL;DR: Preparation de N,N-diethyldithiocarbamate de vinyl-4 benzyle et emploi comme monomere INIFERTER et comme photo INIFTER pour la preparation de copolymere greffe par polymerisation radicalaire as discussed by the authors.
Abstract: Preparation de N,N-diethyldithiocarbamate de vinyl-4 benzyle et emploi comme monomere INIFERTER et comme photo INIFERTER pour la preparation de copolymere greffe par polymerisation radicalaire
125 citations
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TL;DR: The authors proposed a reversible additive-fragmentation chain transfer (RAFT) method for living free-radical polymerization, which can be used with a wide range of monomers and reaction conditions and in each case it provides controlled molecular weight polymers with very narrow polydispersities.
Abstract: mechanism involves Reversible Addition-Fragmentation chain Transfer, and we have designated the process the RAFT polymerization. What distinguishes RAFT polymerization from all other methods of controlled/living free-radical polymerization is that it can be used with a wide range of monomers and reaction conditions and in each case it provides controlled molecular weight polymers with very narrow polydispersities (usually <1.2; sometimes <1.1). Living polymerization processes offer many benefits. These include the ability to control molecular weight and polydispersity and to prepare block copolymers and other polymers of complex architecturesmaterials which are not readily synthesized using other methodologies. Therefore, one can understand the current drive to develop a truly effective process which would combine the virtues of living polymerization with versatility and convenience of free-radical polymerization.2-4 However, existing processes described under the banner “living free-radical polymerization” suffer from a number of disadvantages. In particular, they may be applicable to only a limited range of monomers, require reagents that are expensive or difficult to remove, require special polymerization conditions (e.g. high reaction temperatures), and/or show sensitivity to acid or protic monomers. These factors have provided the impetus to search for new and better methods. There are three principal mechanisms that have been put forward to achieve living free-radical polymerization.2,5 The first is polymerization with reversible termination by coupling. Currently, the best example in this class is alkoxyamine-initiated or nitroxidemediated polymerization as first described by Rizzardo et al.6,7 and recently exploited by a number of groups in syntheses of narrow polydispersity polystyrene and related materials.4,8 The second mechanism is radical polymerization with reversible termination by ligand transfer to a metal complex (usually abbreviated as ATRP).9,10 This method has been successfully applied to the polymerization of various acrylic and styrenic monomers. The third mechanism for achieving living character is free-radical polymerization with reversible chain transfer (also termed degenerative chain transfer2). A simplified mechanism for this process is shown in
4,561 citations
TL;DR: In this article, a review of recent mechanistic developments in the field of controlled/living radical polymerization (CRP) is presented, with particular emphasis on structure-reactivity correlations and "rules" for catalyst selection in ATRP, for chain transfer agent selection in reversible addition-fragmentation chain transfer (RAFT) polymerization, and for the selection of an appropriate mediating agent in stable free radical polymerisation (SFRP), including organic and transition metal persistent radicals.
2,869 citations
TL;DR: A general overview of the preparation, characterization and theories of block copolymer micellar systems is presented in this paper, with examples of micelle formation in aqueous and organic medium are given for di-and triblock copolymers, as well as for more complex architectures.
1,856 citations
TL;DR: This data indicates that self-Assembled Monolayers and Walled Carbon Nanotubes with high adhesion to Nitroxide-Mediated Polymerization have potential in the well-Defined Polymer Age.
Abstract: Keywords: Fragmentation Chain-Transfer ; Self-Assembled Monolayers ; Walled Carbon Nanotubes ; Well-Defined Polymer ; Nitroxide-Mediated Polymerization ; Block-Copolymer Brushes ; Poly(Methyl Methacrylate) Brushes ; Transfer Raft Polymerization ; Quartz-Crystal Microbalance ; Poly(Acrylic Acid) Brushes Reference EPFL-REVIEW-148464doi:10.1021/cr900045aView record in Web of Science Record created on 2010-04-23, modified on 2017-05-10
1,542 citations
TL;DR: In this article, a review of recent literature on polymer brushes with an emphasis on linear polymer brushes attached to solid substrate surfaces is presented. The following topics are included: (i) theoretical and experimental studies of homopolymer brush structure; (ii) theoretical investigations of diblock copolymer brushes; (iii) preparation of hompolymer brushes by physisorption, grafting to and grafting from methods.
1,506 citations