MAEDA Yasushi

FacultyApplied Chemistry and Biotechnology
Teacher OrganizationApplied Chemistry and Biotechnology
Education and
 Research Organization
Faculty of Engineering /Graduate School of Engineering
PositionProfessor
Last Updated: 19/12/20 18:55

Researcher Profile & Settings

Name

    MAEDA Yasushi

Affiliation

  •  Applied Chemistry and Biotechnology Professor

Education

  • Apr. 1985Mar. 1987Kyoto University Graduate School, Division of Engineering 高分子化学専攻
  • Apr. 1981Mar. 1985Kyoto University

Academic & Professional Experience

  • Jan. 2003Fukui University Professor
  • Jun. 1998Jan. 2003Fukui University Associate Professor
  • Apr. 1992Jun. 1998Toyama University Research Assistant
  • Apr. 1987Mar. 1992Sumitomo Chemical Co. Researcher

Research Activities

Published Papers

  • Structure of Polymers as Observed by Vibrational Spectroscopy
    MAEDA YASUSHI
    Sen'i Gakkaishi 72(4) P-213-P-213 2016 Not refereed
  • Infrared Spectroscopic Study on Hydration and Chiral Interaction of Temperature-Responsive Polymer with L-Proline Moieties
    T.Hirano, S. Sugihara, Y.Maeda
     117(50) 16356-16362 Dec.  2013 Refereed
  • Infrared Spectroscopic Study on LCST Behavior of Poly(N,N-bis(2-methoxyethyl)acrylamide)
    T.Hidaka, S. Sugihara, Y.Maeda
     49 675-681 Mar.  2013 Refereed
  • Synthesis of dual thermoresponsive ABA triblock copolymers by both living cationic vinyl polymerization and RAFT polymerization using a dicarboxylic RAFT agent
    S. Sugihara, K. Iwata, S. Miura, A. H. Ma'Radzi, Y.Maeda
    Polymer 54 1043-1052 Feb.  2013 Refereed
  • Thermochromic Microgels and Core-Shell Microgels Based on Fluorescence Resonance Energy Transfer
    K.Okada, Y.Maeda
     130(1) 201-205 Jan.  2013 Refereed
  • Effect of composition and stereoregularity on phase-transition behavior of aqueous N-ethylacrylamide/N-n-propylacrylamide copolymer solutions
    T.Hirano, A.Ono, H.Yamamoto, T.Mori, Y.Maeda, M.Oshimura, K.Ute
     54 5601-5608 Jan.  2013 Refereed
  • Effect of composition and stereoregularity on phase-transition behavior of aqueous N-ethylacrylamide/N-n-propylacrylamide copolymer solutions
    Hirano, Tomohiro;Ono, Akiko;Yamamoto, Hiroaki;Mori, Takeshi;Maeda, Yasushi;Oshimura, Miyuki;Ute, Koichi
    POLYMER 54(21) 5601-5608 Oct.  2013 Refereed
  • Study on hydration of poly(N-vinylcaprolactam) microgels by near-IR and mid-IR spectroscopy
    T. Liu, J. Chen, S. Sugihara, Y.Maeda
    Colloid Polym. Sci. 290(8) 763-767 Mar.  2012 Refereed
  • Study on hydration of poly(N-vinylcaprolactam) microgels by near-IR and mid-IR spectroscopy
    Liu, Tao;Chen, Jianhong;Sugihara, Shinji;Maeda, Yasushi
    COLLOID AND POLYMER SCIENCE 290(8) 763-767 Jun.  2012 Refereed
  • Hydration of temperature-responsive polymers observed by IR spectroscopy
    Y.Maeda
     303(1) 63-70 May  2011 Refereed
  • Transformation of Living Cationic Polymerization of Vinyl Ethers to RAFT Polymerization Mediated by a Carboxylic RAFT Agent
    Sugihara, Shinji;Yamashita, Kenta;Matsuzuka, Keiji;Ikeda, Isao;Maeda, Yasushi
    MACROMOLECULES 45(2) 794-804 Jan.  2012
  • Design of Temperature-Responsive Polymers with Enhanced Hysteresis: a,a-Disubstituted Vinyl Polymers
    T. Mori, S.Beppu, M.R.Berber, H.Mori, T.Makimura, A.Tsukamoto, K.Minagawa, T.Hirano, M.Tanaka, T.Niidome, Y.Katayama, T.Hirano, Y.Maeda
     26(12) 9224-9232 Jun.  2010 Refereed
  • Unusually Large Hysteresis of Temperature-Responsive Poly(N-Ethyl-2-Propionamidoacrylamide) Studied by Microcalorimetry and FT-IR
    M.R.Berber, H. Mori, I.H.Hafez, K. Minagawa, M. Tanaka, T.Niidome, Y.Katayama, A.Maruyama, T.Hirano, Y.Maeda, T. Mori
     114(23) 7784-7790 Jun.  2010 Refereed
  • LCST Behavior of Poly(N-tetrahydrofurfuryl(meth)acrylamide) in Water and Alcohol/Water Mixtures
    Y.Maeda, Takaku, S.
     114 13110-13115 Jan.  2010 Refereed
  • Design of Temperature-Responsive Polymers with Enhanced Hysteresis: alpha,alpha-Disubstituted Vinyl Polymers
    Mori, Takeshi;Beppu, Suguru;Berber, Mohamed R.;Mori, Hironori;Makimura, Takumi;Tsukamoto, Ayako;Minagawa, Keiji;Hirano, Tomohiro;Tanaka, Masami;Niidome, Takuro;Katayama, Yoshiki;Hirano, Tatsuya;Maeda, Yasushi
    LANGMUIR 26(12) 9224-9232 Jun.  2010
  • Unusually Large Hysteresis of Temperature-Responsive Poly(N-ethyl-2-propionamidoacrylamide) Studied by Microcalorimetry and FT-IR
    Berber, Mohamed R.;Mori, Hironori;Hafez, Inas H.;Minagawa, Keiji;Tanaka, Masami;Niidome, Takuro;Katayama, Yoshiki;Maruyama, Atsushi;Hirano, Tomohiro;Maeda, Yasushi;Mori, Takeshi
    JOURNAL OF PHYSICAL CHEMISTRY B 114(23) 7784-7790 Jun.  2010
  • Lower critical solution temperature behavior of poly(N-tetrahydrofurfuryl(meth)acrylamide) in water and alcohol-water mixtures.
    Maeda Yasushi;Takaku Shinji
    The journal of physical chemistry. B 114(41) 13110-13115 2010
    :The temperature responsiveness of poly(N-tetrahydrofurfurylacrylamide) (PTHFA, phase transition temperature, T(p) = 38 °C) and poly(N-tetrahydrofurfurylmethacrylamide) (PTHFMA, T(p) = 43 °C) in water and alcohol-water mixtures was investigated by infrared and Raman spectroscopy. Their T(p) increased monotonically with increasing concentration of added methanol but exhibited a re-entrant behavior in 1-propanol-water mixtures. Their amide I bands consist of three components because of doubly, singly, and zero hydrogen-bonding amide carbonyls in these mixtures, and the average number of hydrogen bonds per one C═O decreased with increasing concentration of the alcohols. A red shift of the amide II band also indicates decrease of H-bonding to the N-H group. The reduction then destabilizes the solution and lowers T(p). On the other hand, red shifts of the ν(C-H) bands indicate replacement of hydrophobically hydrating water molecules by the alcohols, which may stabilize the solutions. The latter and the former effect may be more effective in the methanol-water and the 1-propanol-water mixtures, respectively. The behaviors of the copolymers of N-isopropylacrylamide and N-tetrahydrofurfurylacrylamide or N-tetrahydrofurfurylmethacrylamide in methanol-water mixtures gradually changed from a monotonous behavior to a reentrant one with an increasing content of N-isopropylacrylamide, suggesting that the interaction between each individual monomer unit and solvent molecules cooperatively determines their behaviors as a whole.
  • Lower Critical Solution Temperature Behavior of Poly(N-(2-ethoxyethyl)acrylamide) as Compared with Poly(N-isopropylacrylamide)
    Y.Maeda, J.Sakamoto, S.Wang, Y.Mizuno
     113 12456 - 12461 Aug.  2009 Refereed
  • Syndiotactic Poly(N-n-propylacrylamide) shows Highly Cooperative Phase Transition
    T.Mori, T.Hirano, A.Maruyama, Y.Katayama, T.Niidome, Y.Bando, K.Ute, S.Takaku, Y.Maeda
     25(1) 48-50 Jan.  2009 Refereed
  • Confocal Micro-Raman and Infrared Spectroscopic Study on the Phase Separation of Aqueous Poly(2-(2-methoxyethoxy)ethyl (meth)acrylate) Solutions
    Y.Maeda, H.Yamauchi, T.Kubota
     25(1) 479-482 Jan.  2009 Refereed
  • A Unique Phase Behavior of Random Copolymer of N-isopropylacrylamide and N,N-diethylacrylamide in Water
    Y.Maeda, M.Yamabe
     50(2) 519-523 Jan.  2009 Refereed
  • Lower Critical Solution Temperature Behavior of Poly (N-(2-ethoxyethyl)acrylamide) as Compared with Poly(N-isopropylacrylamide)
    Maeda, Yasushi;Sakamoto, Junichi;Wang, Shuang-yin;Mizuno, Yuuichi
    JOURNAL OF PHYSICAL CHEMISTRY B 113(37) 12456-12461 Sep.  2009
  • LCST and UCST Behavior of Poly(N-isopropylacrylamide) in DMSO/Water Mixed Solvents Studied by IR and Micro-Raman Spectroscopy
    H.Yamauchi, Y.Maeda
     111(45) 12964-12968 Nov.  2007 Refereed
  • Infrared spectroscopic investigation of poly(2-methoxyethyl vinyl ether) during thermosensitive phase separation in water
    Y.Maeda, H.Yamauchi, M.Fujisawa, S.Sugihara, I.Ikeda, S.Aoshima
     23(12) 6561-6566 Jun.  2007 Refereed
  • Hydration changes of poly(2-(2-methoxyethoxy)ethyl methacrylate) during thermosensitive phase separation in water
    Y.Maeda, T.Kubota, H.Yamauchi, T.Nakaji, H.Kitano
     23(22) 11259-11265 Jan.  2007 Refereed
  • Soluble- insoluble- soluble transitions of aqueous poly(N-vinylacetamide-co-acrylic acid) solutions
    T.Mori, M.Nakashima, Y.Fukuda, K.Minagawa, M.Tanaka, Y.Maeda
     22(9) 4336-4342 Apr.  2006 Refereed
  • Effects of Ionization on Phase Behaviors of Poly(N-isopropylacrylamide-co-acrylic acid) and Poly(N,N-diethylacrylamide-co-acrylic acid) in Water
    Y.Maeda, H.Yamamoto, I.Ikeda
    (282) 1268-1273 Sep.  2004 Refereed
  • Micro-Raman Spectroscopic Investigation on Phase Separation of Poly(vinyl methyl ether)/ Alcohol/ Water Ternary Mixtures
    Y.Maeda, H.Yamamoto, I.Ikeda
     20 7339-7341 Aug.  2004 Refereed
  • Hydration Change during Thermosensitive Association of a Block Copolymer Consisting of LCST and UCST Blocks
    Y.Maeda, H.Mochiduki, I.Ikeda
     25 1330-1334 Jul.  2004 Refereed
  • Association of Tetraalkylammonium Ions with Poly(vinyl methyl ether) in Water and Its Effect on Phase Separation Behavior as Studied by Micro-Raman Spectroscopy
    Y.Maeda, H.Yamamoto, I.Ikeda
     25 720–723 Mar.  2004 Refereed
  • Effects of Ions on Two-step Phase Separation of Poly(vinyl methyl ether) in Water as Studied by IR and Raman Spectroscopy
    Y.Maeda, H.Mochiduki, H.Yamamoto, Y.Nishimura, I.Ikeda
     Nov.  2003 Refereed
  • Phase Separation of Aqueous Solutions of Poly(N-isopropylacrylamide) Investigated by Confocal Raman Microscopy
    Y.Maeda, H.Yamamoto, I.Ikeda
     Jul.  2003 Refereed
  • Temperature-Responsive Graft Copolymers with Poly(propylene glycol) Side Chains
    Y.Maeda, M.Tsubota, I.Ikeda
     Mar.  2003 Refereed
  • Fourier-transform IR Spectroscopic Study on Phase Transitions of Copolymers of N-Isopropylacrylamide and Alkyl Acrylates in Water
    Y.Maeda, M.Tsubota, I.Ikeda
     Jan.  2003 Refereed
  • Change in Solvation of Poly(N, N-diethylacrylamide) during Phase Transition in Aqueous Solutions as Observed by IR Spectroscopy
    Y.Maeda, T.Nakamura, I.Ikeda
     Dec.  2002 Refereed
  • Spectroscopic Study on the Structure of Horseradish Peroxidase in Water/Dimethyl Sulfoxide Mixture
    Y.Maeda, M.Fujihara, I.Ikeda
     Mar.  2002 Refereed
  • Hydration and Phase Behavior of Poly(N-vinylcaprolactam) and Poly(N-vinylpyrrolidone) in Water
    Y.Maeda, T.Nakamura, I.Ikeda
     Jan.  2002 Refereed
  • Changes in the Hydration States of Poly(N-n-propylmethacrylamide) and Poly(N-isopropylmethacrylamide) during Their Phase Transitions in Water Observed by FTIR Spectroscopy
    Y.Maeda, T.Nakamura, I.Ikeda
     Nov.  2001 Refereed
  • FTIR Spectroscopic and Calorimetric Studies of the Phase Transitions of N-isopropylacrylamide Copolymers in Water
    Y.Maeda, T.Higuchi, I.Ikeda
     Nov.  2001 Refereed
  • Changes in the Hydration State of a Block Copolymer of Poly(N-isopropylacrylamide) and Poly(ethylene oxide) on Thermosensitive Micellization in Water
    Y.Maeda, N.Taniguchi, I.Ikeda
     Nov.  2001 Refereed
  • IR Spectroscopic study on the Hydration and the Phase Transition of Poly(vinyl methyl ether) in Water
    Y.Maeda
     Mar.  2001 Refereed
  • Change in the Hydration State of Poly(N-alkylacrylamide)s during the Phase Transition in Aqueous Solutions Observed by FTIR Spectroscopy
    Y.Maeda, T.Nakamura, I.Ikeda
     Feb.  2001 Refereed
  • Effects of Ionization of Incorporated Imidazole Groups on the Phase Transitions of Poly(N-isopropylacrylamide), Poly(N,N-diethylacrylamide) and Poly(N-vinylcaprolactam) in Water
    Y.Maeda, H.Yamamoto, I.Ikeda
     Jan.  2001 Refereed
  • Change in Hydration State during the Coil-Globule Transition of Aqueous Solutions of Poly(N-isopropylacrylamide) as Evidenced by FTIR Spectroscopy
    Y.Maeda, T.Higuchi, I.Ikeda
     Sep.  2000 Refereed
  • Vibrational Spectroscopic Study on the Structure of Water in Polymer Systems
    Y.Maeda, M.Ide, H.Kitano
     1999 Refereed
  • State of Water inside and at the surface of Poly(ethyleneglycol) Films Examined by FT-IR
    M.Ide, D.Yoshikawa, Y.Maeda, H.Kitano
     1999 Refereed
  • Stereoselective Inclusion of DOPA Derivatives by a Self-Assembled Monolayer of Thiolated Cyclodextrin on a Gold Electrode
    T.Fukuda, Y.Maeda, H.Kitano
     1999 Refereed
  • Inclusional Complexation by Cyclodextrin-Polymer Conjugates in Organic Solvents
    T.Hirasawa, Y.Maeda, H.Kitano
     Jul.  1998 Refereed
  • Syndiotactic Poly(N-n-propylacrylamide) Shows Highly Cooperative Phase Transition
    Mori, Takeshi;Hirano, Tomohiro;Maruyama, Atsushi;Katayama, Yoshiki;Niidome, Takuro;Bando, Yoichi;Ute, Koichi;Takaku, Shinji;Maeda, Yasushi
    LANGMUIR 25(1) 48-50 Jan.  2009
  • Infrared spectroscopic investigation of poly(2-methoxyethyl vinyl ether) during thermosensitive phase separation in water
    Maeda, Yasushi;Yamauchi, Hideo;Fujisawa, Mie;Sugihara, Shinji;Ikeda, Isao;Aoshima, Sadahito
    LANGMUIR 23(12) 6561-6566 Jun.  2007
  • Hydration changes of poly(2-(2-methoxyethoxy)ethyl methacrylate) during thermosensitive phase separation in water
    Maeda, Yasushi;Kubota, Tomoyuki;Yamauchi, Hideo
    LANGMUIR 23(22) 11259-11265 Oct.  2007
  • Micro-Raman spectroscopic investigation on the phase separation of poly(vinyl methyl ether)/alcohol/water ternary mixtures.
    Maeda Yasushi;Yamamoto Hiroki;Ikeda Isao
    Langmuir : the ACS journal of surfaces and colloids 20(17) 2004
  • Spectroscopic study on structure of horseradish peroxidase in water and dimethyl sulfoxide mixture.
    Maeda Yasushi;Fujihara Maki;Ikeda Isao
    Biopolymers 67(2) 2002
    :The structure of horseradish peroxidase (HRP) in phosphate buffered saline (PBS)/dimethyl sulfoxide (DMSO) mixed solvents at different compositions is investigated by IR, electronic absorption, and fluorescence spectroscopies. The fluorescence spectra and the amide I spectra of ferric HRP [HRP(Fe3+)] show that overall structural changes are relatively small up to 60% DMSO. Although the amide I band of HRP(Fe3+) shows a gradual change in the secondary structure and a decrease in the contents of a helices, its fluorescence spectra indicate that the distance between the heme and Trp173 is almost constant. In contrast, the changes in the positions of the Soret bands for resting HRP(Fe3+) and catalytic intermediates (compounds I and II) and the IR spectra at the C-O stretching vibration mode of carbonyl ferrous HRP [HRP(Fe2+)-CO] show that the microenvironment in the distal heme pocket is altered, even with low DMSO contents. The large reduction of the catalytic activity of HRP even at low DMSO contents can be attributed to the structural transition in the distal heme pocket. In PBS/DMSO mixtures containing more than 70 vol % DMSO, HRP undergoes large structural changes, including a large loss of the secondary structure and a dissociation of the heme from the apoprotein. The presence of the components of the amide I band that can be assigned to strongly hydrogen bonding amide C=O groups at 1616 and 1684 cm(-1) suggests that the denatured HRP may aggregate through strong hydrogen bonds.
  • Controlled Radical Homopolymerization of Representative Cationically-Polymerizable Vinyl Ethers
    Shinji Sugihara, Ayano Yoshida, Taka-aki Kono, Tsuyoshi Takayama, Yasushi Maeda
    Journal of the American Chemical Society 141(35) 1346-1356 Aug.  2019 Refereed
    :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.
  • Synthesis and Nano-object Assembly of Biomimetic Block Copolymers for Catalytic Silver Nanoparticles
    Shinji Sugihara, Masahiro Sudo, Yasushi Maeda
    Langmuir 35 1346-1356 Feb.  2019 Refereed
  • Transformation from xanthate-type cationogen mediated metal-free RAFT cationic polymerization with “HCl・Et2O” into RAFT radical polymerization to form poly(alkyl vinyl ether)-b-polyvinyl alcohol amphiphiles
    Shinji Sugihara, Yoshihiro Sakamoto, Nakayama Masakazu, Keigo Michishita, Yasushi Maeda
    Polymer 154 153-163 Sep.  2018 Refereed
  • Synthesis of Various Poly(2-Hydroxyethyl Vinyl Ether)-Stabilized Latex Particles via Surfactant-Free Emulsion Polymerization in Water
    Shinji Sugihara, Masahiro Sudo, Kazumasa Hirogaki, Satoshi Irie, Yasushi Maeda
    Macromolecules 51(4) 1260-1271 Feb.  2018 Refereed
    Following the recent success of the controlled radical polymerization of hydroxy-functional vinyl ethers [Macromolecules2016, 49, 1563; 2017, 50, 8346], we report a surfactant-free, batch emulsion polymerization stabilized by the poly(hydroxy-functional vinyl ether)s. A series of emulsion polymerizations of various hydrophobic monomers such as vinyl acetate (VAc), methyl methacrylate (MMA), ethyl acrylate (EA), and styrene (St) were performed using poly(2-hydroxyethyl vinyl ether) (PHEVE) with hydrophilic azoinitiator, 2,2′-azobis(2-amidinopropane) dihydrochloride. In the emulsion polymerization in water using PHEVE as a steric stabilizer, the polymerization proceeded smoothly to form PHEVE-stabilized spherical particles without any coagulation. The mean particle diameter could be controlled over a size range (261 nm–ca. 1 μm) with relatively narrow size distributions by varying the synthesis parameters. Furthermore, one-pot emulsion polymerization was also conducted from HEVE to poly(vinyl acetate) (PVAc) latex particles through PHEVE. However, in the case of other analogous stabilizers such as poly(4-hydroxybutyl vinyl ether) (PHBVE) and poly(2-metoxyethyl vinyl ether) (PMOVE) as a more hydrophobic stabilizer than PHEVE, highly stable latex particles were not formed, with the exception of PMOVE-stabilized PSt latex particles (micelles). The dispersing ability of PHEVE was further confirmed by RAFT emulsion polymerization of VAc. The RAFT emulsion polymerization of VAc using PHEVE macromolecular chain transfer (macro-CTA) proceeded in water to form PHEVE-b-PVAc latex particles with 71–293 nm size depending on degree of PVAc block. However, using binary mixed PHEVE and thermoresponsive PHBVE macro-CTAs, the resulting latex particles formed small aggregate of particles at 20 °C due to the decrease in stability and hydrophilicity relative to PHEVE. All the products using PHEVE successfully prepared are core–shell particles with PHEVE shells which give high dispersion stability for hydrophobic core. Such PHEVE-stabilized particles resulted in highly ordered three-dimensional colloidal crystals owing to the interaction of their hydrophilic PHEVE surfaces.
  • Design of Hydroxy Functionalized Thermoresponsive Copolymers: Improved Direct Radical Polymerization of Hydroxy-Functional Vinyl Ethers
    Shinji Sugihara, Ayano Yoshida, Satoshi Fujita, Yasushi Maeda
    Macromolecules 50(21) 8346-8356 Oct.  2017 Refereed
  • Metal-free RAFT cationic polymerization of p-methoxystyrene with HCl・Et2O using a xanthate-type RAFT cationogen
    Shinji Sugihara,Seiya Okubo, Yasushi Maeda
    Polymer Chemistry 7(44) 6854-6863 Oct.  2016 Refereed
  • Direct Radical Polymerization of Vinyl Ethers: Reversible Addition-Fragmentation Chain Transfer Polymerization of Hydroxy-Functional Vinyl Ethers
    Shinji Sugihara, Yuki Kawamoto, Yasushi Maeda
    Macromolecules 49 1563-1574 Mar.  2016 Refereed
    Unprecedented controlled radical vinyl polymerization (CRP) of vinyl ethers using reversible addition–fragmentation chain transfer (RAFT) polymerization is reported. In order to overcome the challenge of direct radical polymerization of vinyl ethers, commercial hydroxy-functional vinyl ethers such as 2-hydroxyethyl vinyl ether (HEVE) were subjected to free radical polymerization, generating vinyl polymers without polyacetals obtained by self-polyaddition polymerization. In the case of bulk polymerization using a nonacidic azo-initiator such as dimethyl 2,2′-azobis(2-methylpropionate), conventional free radical vinyl polymerization occurred with sufficiently high number-average molecular weight. For example, poly(HEVE) was produced from the corresponding HEVE monomer with Mn = 26 400 in high yield, ≥75%. The resulting polymer was nearly identical to the polymer prepared by living cationic polymerization using the protected monomers except for the steric regularity (meso dyads are 51% and 67% for radical and cationic polymerizations, respectively). Furthermore, cyanomethyl methyl(phenyl)carbamodithioate was found to be an efficient RAFT agent, enabling the CRP of hydroxy-functional vinyl ethers. Under the polymerization conditions, poly(HEVE) macromolecular chain transfer agent (macro-CTA) was prepared. The kinetic studies of RAFT polymerization showed a linear increase of the molecular weight, with up to 50% monomer conversion and relatively low polydispersities (Mw/Mn < 1.38). In addition, chain extension experiments including block copolymerization with vinyl acetate and N-vinylpyrrolidone were demonstrated using the resulting poly(HEVE) macro-CTA to confirm the “livingness” of the poly(HEVE).
  • In situ nano-objects via RAFT aqueous dispersion polymerization of 2-methoxyethyl acrylate using poly(ethylene oxide) macromolecular chain transfer agent as steric stabilizer
    Sugihara, Shinji;Ma'Radzi, Akmal Hadi;Ida, Shota;Irie, Satoshi;Kikukawa, Takamaru;Maeda, Yasushi
    POLYMER 76 17-24 Aug.  2015 Refereed
  • HCl・Et2O-Catalyzed Metal-Free RAFT Cationic Polymerization: One-Pot Transformation from Metal-Free Living Cationic Polymerization to RAFT Radical Polymerization
    Shinji Sugihara, Naoto Konegawa, Yasushi Maeda
    Macromolecules 48(15) 5120-5131 Jul.  2015 Refereed
    The metal-free RAFT cationic polymerization (MRCP) of vinyl ethers (VEs) mediated by HCl·Et2O and 1-isobutoxyethyl ethanedithioate (IDTA) as a RAFT cationogen was demonstrated. The IDTA was efficiently catalyzed and the cationic polymerization was initiated by the HCl·Et2O, allowing good control over the molecular weight, polydispersity, and chain end structure of the resulting polyVEs. The propagation step is considered to involve a reversible addition–fragmentation chain transfer (RAFT) to the growing carbocationic species. Thus, the resulting polyVEs can exhibit high number-average end functionality at the RAFT terminal group, depending on the [IDTA]0/[HCl]0 ratio. The polymers obtained by this process could be used as macro-chain transfer agents for the RAFT radical polymerization of radically polymerizable monomers such as (meth)acrylates and styrenes to synthesize novel block copolymers. Significantly, this MRCP system allows a one-pot transformation from MRCP to RAFT radical polymerization as a result of the metal-free nature of the processes. The syntheses of block copolymers were confirmed by GPC and the formation of novel thermoresponsive micelles in water by the amphiphilic block copolymer poly(2-ethoxyethyl vinyl ether)-b-poly[poly(ethylene glycol) methyl ethyl acrylate] was observed.
  • Synthesis of polyvinyl alcohol stereoblock copolymer via the combination of living cationic polymerization and RAFT/MADIX polymerization using xanthate with vinyl ether moiety
    A. H. Ma’Radzi, S. Sugihara, T. Toida, Y.Maeda
    Polymer 55 5332-5345 Sep.  2014 Refereed
  • Synthesis of thermoresponsive block and graft copolymers via the combination of living cationic polymerization and RAFT polymerization using a vinyl ether-type RAFT agent
    A. H. Ma'Radzi, S. Sugihara, S. Miura, N. Konegawa, Y.Maeda
    Polymer 55 1920-1930 Apr.  2014 Refereed

Books etc

  • Chapter 8. Infrared and Raman Spectroscopy of Temperature-Responsive Polymers. in "Temperature-responsive polymers: Chemistry, Properties and Applications"
    Y.Maeda
    Wiley Jul.  2018
    978-1-119-15778-6

Conference Activities & Talks

  • Hydration of temperature-responsive polymers observed by IR spectroscopy
    Y.Maeda
     Jul.  2010
  • Phase Separation of Aqueous Polymer Solutions Studied by IR and Raman Spectroscopy
    Y.Maeda
     Dec.  2004
  • IR spectroscopic study on the hydration and phase transition of poly(N-substituted acrylamide)s in aqueous solutions
    Y.Maeda, T.Nakamura, I.Ikeda
     Dec.  2000
  • RAFT Cationic and Radical Polymerization Using Dual RAFT agent
    Keisuke Matsushita,Shinji Sugihara,Yasushi Maeda
    68th Symposium on Macromolecules Sep.  2019 The Society of Polymer Science, Japan
  • Controlled Radical Polymerization of Various Functional Vinyl Ethers
    Shiori Kanda,TsuyoshiS Takayama,Shinji Sugihara,Yasushi Maeda
    68th Symposium on Macromolecules Sep.  2019
  • Synthesis of thermal history recognition block copolymer assembly by RAFT aqueous dispersion polymerization
    Yuto Tsutsui, Shinji Sugihara, Hideyuki Uematsu, Yasushi Maeda
     Nov.  2019
  • RAFT Emulsion Polymerization-Induced Self-Assembly Using Poly(Hydroxy Functional Vinyl Ether)
    Ryuya Kawakami, Shinji Sugihara, Yasushi Maeda
    68th Symposium on Macromolecules Sep.  2019 The Society of Polymer Science, Japan
  • Synthesis of Block Copolymer Assembly that Recognizes Thermal History via RAFT Aqueous Dispersion Polymerization
    Yuto Tsutsui, Shinji Sugihara, Hideyuki Uematsu, Yasushi Maeda
    68th Symposium on Macromolecules Sep.  2019 The Society of Polymer Science, Japan
  • Grafting of Substitute PVA: Organic Catalyzed Ring-Opening Polymerization of Cyclic Esters from Poly[(2-hydroxyethyl vinyl ether)-ran-(vinyl acetate)]
    Akane Ohori, Shinji Sugihara, Yasushi Maeda
    68th Symposium on Macromolecules Sep.  2019 The Society of Polymer Science, Japan
  • Isomerization Cationic Polymerization of Dihydropyran Derivatives for Alternating Sequence Control
    安田 宗太郎 、杉原 伸治 、前田 寧
    68th Symposium on Macromolecules Sep.  2019 The Society of Polymer Science, Japan
  • Direct Radical Polymerization of Various Functional Vinyl Ethers
    Shinji Sugihara,Taka-aki Kono,Tsuyoshi Takayama,Keisuke Matsushita,Yasushi Maeda
    68th SPSJ Annual Meeting May  2019 The Society of Polymer Science, Japan
  • RAFT Emulsion Polymerization-Induced Self-Assembly Using Poly(Hydroxyl-Functional Vinyl Ether)
    Ryuya Kawakami,Shinji Sugihara,Yasushi Maeda
    68th SPSJ Annual Meeting May  2019 The Society of Polymer Science, Japan