SAKAI Wataru

FacultyMaterials Science and Engineering
PositionProfessor
Last Updated :2021/09/17

Profile

Degree

  • 1981/03
  • 1997/03

Campus Career

  • 1994/04-2004/07, Kyoto Institute of Technology, Research Associate
  • 2004/08-2007/06, Kyoto Institute of Technology, Junior Associate Professor
  • 2007/07-2021/02, Kyoto Institute of Technology, Associate Professor
  • 2021/03-, Kyoto Institute of Technology, Professor
  • Homepage

    Educational Activities

    Classes

    • Seminar in Information Processing
    • Polymer Chemistry
    • Polymer Materials Chemistry
    • Materials Chemistry for Photo-Electronics
    • Function and Physical Properties of Polymeric Materials

    Syllabus

    Display

    Research Activities

    Research Field

    • Research Project:
      • Radical Analysis of Degradation Mechanism of Polymer Materials by Spin-Trapping Method
      • Analysis of Polymer Reaction
      • Research and Development of Photo-Functional Polymer Materials
    • Seeds of Knowledge:Display

    Association Memberships

      The Society of Polymer Science, Japan, The Society of Electron Spin Resonance and Technology, The Society of Rubber Science and Technology, Japan, The Society of Fiber Science and Technology, Japan, The Chemical Society of Japan, Material Life Society, Japan

    Papers

    • Investigation of Thermal Degradation Mechanism of Polyurethane Materials by Spin-Trapping Method
      Author : SAKAI Wataru
      Journal : デサントスポーツ科学
      Publication Date : 2020/09
      Volume,Number,Page : 41号,260-271
    • Effect of Scouring and Bleaching on Chemical Modification of Cotton Sliver by EB-Induced Graft Polymerization
      Author : Takuya Honda, Wataru Sakai, Koji Miyazaki, and Kenji Hisada
      Journal : Journal of Fiber Science and Technology
      Publication Date : 2020/01
      Volume,Number,Page : 76巻4号,119-126
    • Four-Factor Optimization for PET Glycolysis with Consideration of the Effect of Sodium Bicarbonate Catalyst using Response Surface Methodology
      Author : Van-Pham, D,-T, Le, Q,-H, Lam, T,-N, Nguyen, C,-N, Sakai, W
      Journal : Polymer Degradation and Stability
      Publication Date : 2020/09
      Volume,Number,Page : 179, 109257
    • X-ray Visualization and Quantification using Fibrous Color Dosimeter Based on Leuco Dye
      Author : Vo, P, P, Doan, H, N, Kinashi, K, Sakai, W, Tsutsumi, N, Huynh, D, P
      Journal : Applied Sciences (Switzerland)
      Publication Date : 2020/05
      Volume,Number,Page : 10(11), 3798
    • Theoretical Limit of the Color-Change Sensitivity of a Composite Resin Dosimeter Film Based on Spiropyran/BaFCl : Eu2+/Polystyrene
      Author : Kinashi, K, Tsuchida, H, Sakai, W, Tsutsumi, N
      Journal : Chemistry Open
      Publication Date : 2020/05
      Volume,Number,Page : 9(5),623-627
    • Ferroelectric Performance of Nylons 6-12, 10-12, 11-12, and 12-12
      Author : Yanaka, A, Sakai, W, Kinashi, K, Tsutsumi, N.
      Journal : RSC Advances
      Publication Date : 2020/10
      Volume,Number,Page : 10(27), 15740-15750
    • Antibacterial and Osteoconductive Effects of Chitosan/Polyethylene Oxide (PEO)/Bioactive Glass Nanofibers for Orthopedic Applications
      Author : Boschetto, F, Doan, H, N, Vo, P, P, Zanocco, M, Zhu, W, Sakai, W, Adachi, T, Ohgitani, E, Tsutsumi, N, Mazda, O, Kinashi, K, Marin, E, Pezzotti, G 
      Journal : Applied Sciences (Switzerland),
      Publication Date : 2020/03
      Volume,Number,Page : 10(7), 2360
    • Ferroelectric switching in spin‐coated nylons 11 and 12
      Author : Ayumi Yanaka, Wataru Sakai, Kenji Kinashi, Naoto Tsutsumi
      Journal : Journal of Applied Polymer Science
      Publication Date : 2020/03
      Volume,Number,Page : 137(10), 48438
    • Preparation of a Novel Flame Retardant Formulation for Cotton Fabric
      Author : Hung Kim Nguyen, Wataru Sakai, and Congtranh Nguyen
      Journal : Materials
      Publication Date : 2019/12
      Volume,Number,Page : 13(1), 54
    • Facile and Scalable Fabrication of Porous Polystyrene Fibers for Oil Removal by Centrifugal Spinning
      Author : Hoan Ngoc Doan, Dien Kim Nguyen, Phu Phong Vo, Kohei Hayashi, Kenji Kinashi, Wataru Sakai, Naoto Tsutsumi, Dai Phu Huynh
      Journal : ACS Omega
      Publication Date : 2019/09
      Volume,Number,Page : 4, 15992
    • High-Performance All-Organic DFB and DBR Waveguide Laser with Various Grating Height Fabricated by a Two-Photon Absorption DLW Method
      Author : Naoto Tsutsumi, Keiichi Kaida, Kenji Kinashi, Wataru Sakai
      Journal : Scientific Reports
      Publication Date : 2019/07
      Volume,Number,Page : 9, 1058
    • Leuco-Based Composite Resin Dosimeter Film
      Author : Takato Iwata, Kenji Kinashi, Hoan Ngoc Doan, Phu Phong Vo, Wataru Sakai, Naoto Tsutsumi
      Journal : ACS Omeg
      Publication Date : 2019/07
      Volume,Number,Page : 4, 9946
    • Holographic Performance of Azo-Carbazole Dye-Doped UP Resin Films Using a Dyeing Process
      Author : Kenji Kinashi, Isana Ozeki, Ikumi Nakanishi, Wataru Sakai, Naoto Tsutsumi
      Journal : Materials
      Publication Date : 2019/03
      Volume,Number,Page : 12, 945
    • Understanding ferroelectric performances of spin-coated odd–odd nylon thin films
      Author : Naoto Tsutsumi, Nahoko Kajimoto, Kenji Kinashi, Wataru Sakai
      Journal : Journal of Applied Polymer Science
      Publication Date : 2019/05
      Volume,Number,Page : 136, 47595
    • Flexible All-Organic Photorefractive Devices
      Author : Kenji Kinashi, Mei Matsumura, Wataru Sakai, Naoto Tsutsumi
      Journal : ACS Applied Electronic Materials
      Publication Date : 2019/01
      Volume,Number,Page : 1, 238
    • Optimal composition of the poly(triarylamine)-based polymer composite to maximize photorefractive performance
      Author : Masumura, K., Nakanishi, I., Van Thi Khuat, K., Kinashi, K., Sakai, W., Tsutsumi, N.
      Journal : Scientific Reports
      Publication Date : 2019/01
      Volume,Number,Page : 9(1), 739
    • Understanding ferroelectric performances of spin-coated odd–odd nylon thin films
      Author : Tsutsumi, N., Kajimoto, N., Kinashi, K., Sakai, W.
      Journal : Journal of Applied Polymer Science
      Publication Date : 2019/02
      Volume,Number,Page : 136(20), 47595
    • Electron spin resonance and photoelectron yield spectroscopic studies for photocarrier behavior in photorefractive polymeric composites
      Author : Tanaka, Y., Kinashi, K., Kono, K., Sakai, W., Tsutsumi, N.
      Journal : Organic Electronics: physics, materials, applications
      Publication Date : 2019/03
      Volume,Number,Page : 68, 248-255
    • Holographic performance of azo-carbazole dye-doped UP resin films using a dyeing process
      Author : Kinashi, K., Ozeki, I., Nakanishi, I., Sakai, W., Tsutsumi, N.
      Journal : Materials
      Publication Date : 2019/03
      Volume,Number,Page : 16(6), 945
    • Material Design of Azo-Carbazole Copolymers for Preservation Stability with Rewritable Holographic Stereograms
      Author : Kinashi, K., Nakanishi, I., Sakai, W., Tsutsumi, N.
      Journal : Macromolecular Chemistry and Physics
      Publication Date : 2018/12
      Volume,Number,Page : 220(2), 1800456
    • Influence of an Interfacial Effect on the Laser Performance of a Rhodamine 6G/Cellulose Acetate Waveguide on a Vinylidene Fluoride Copolymer Layer
      Author : Tsutsumi, N., Hirano, Y., Kinashi, K., Sakai, W.
      Journal : Langmuir
      Publication Date : 2018/06
      Volume,Number,Page : 34(25), 7525-7535
    • Centrifugally spun recycled PET: Processing and characterization
      Author : Vo, P.P., Doan, H.N., Kinashi, K., Sakai, W., Tsutsumi, N., Huynh, D.P.
      Journal : Polymers
      Publication Date : 2018/06
      Volume,Number,Page : 10(6), 680
    • Composite resin dosimeter: a new concept and design for a fibrous color dosimeter
      Author : Kenji Kinashi, Takato Iwata, Hayato Tsuchida, Wataru Sakai, Naoto Tsutsumi
      Journal : ACS Applied Materials and Interfaces
      Publication Date : 2018/04
      Volume,Number,Page : 10 (14) 11926
    • Photorefractive dynamics in poly(triarylamine)-based polymer composite: an approach utilizing a second electron trap to reduce the photoconductivity
      Author : Kento Masumura, Tsuyoshi Oka, Kenji Kinashi, Wataru Sakai, Naoto Tsutsumi
      Journal : Optical Materials Express
      Publication Date : 2018/02
      Volume,Number,Page : 8(2), 401-412
    • Spin-Trapping Analysis and Characterization of Thermal Degradation of Thermoplastic Poly(ether–ester) Elastomer
      Author : Masayo Sono, Kenji Kinashi , Wataru Sakai* , and Naoto Tsutsumi
      Journal : Macromolecules
      Publication Date : 2018/01
      Volume,Number,Page : 51(3), 1088-1099
    • Direct laser writing for micro-optical devices using a negative photoresist
      Author : Naoto Tsutsumi, Junichi Hirota, Kenji Kinashi, Wataru Sakai
      Journal : Optics Express
      Publication Date : 2017/12
      Volume,Number,Page : 25(25), 31539
    • Influence of baking conditions on 3D microstructures by direct laser writing in negative photoresist SU-8 via two-photon polymerization
      Author : Naoto Tsutsumi, Nanaho Sakamoto, Ryotato Nakamura, Kenji Kinashi, Wataru Sakai
      Journal : Journal of Laser Applications
      Publication Date : 2017/11
      Volume,Number,Page : 29, 042010
    • Fabrication of three-dimensional microstructures in positive photoresist through two-photon direct laser writing
      Author : Naoto Tsutsumi, Asato Fukuda, Ryotaro Nakamura, Kenji Kinashi, Wataru Sakai
      Journal : Applied Physics A
      Publication Date : 2017/07
      Volume,Number,Page : 123, 553
    • Fabrication and photochromic properties of Forcespinning® fibers based on spiropyran-doped poly(methyl methacrylate)
      Author : Hoan Ngoc Doan, Hayato Tsuchida, Takato Iwata, Kenji Kinashi*, Wataru Sakai, Naoto Tsutsumi, Dai Phu Huynh
      Journal : RSC Advances
      Publication Date : 2017/06
      Volume,Number,Page : 7. 33061-33067
    • Carrier-assisted dyeing of poly(L-lactic acid) fibers with dispersed photochromic spiropyran dyes
      Author : Kenji Kinashi, Tatsuya Suzuki, Hidekazu Yasunaga, Hayato Tsuchida, Wataru Sakai, Naoto Tsutsumi, Hideki Yamane
      Journal : Dyes and Pigments
      Publication Date : 2017/06
      Volume,Number,Page : 145, 444-450
    • Advantage of the circular polarization of light in the updatable holographic response in an azo-carbazole monolithic dye dispersed acrylate matrix
      Author : Naoto Tsutsumi, Yuuki Yabuhara, Kenji Kinashi, and Wataru Sakai
      Journal : Optical Materials Express
      Publication Date : 2017/05
      Volume,Number,Page : 7(5), 1647-1655
    • Spin-Trapping Analysis of Thermal Degradation Reaction of Poly(butylene terephthalate)
      Author : Masayo Sono, Kenji Kinashi, Wataru Sakai* , and Naoto Tsutsumi
      Journal : Macromolecules
      Publication Date : 2017/01
      Volume,Number,Page : 50(1), pp.254-263
    • Re-evaluation of all-plastic organic dye laser with DFB structure fabricated using photoresists
      Author : Naoto Tsutsumi, Saori Nagi, Kenji Kinashi, Wataru Sakai
      Journal : Scientific Reports
      Publication Date : 2016/10
      Volume,Number,Page : 6, pp34741
    • Radiation-induced color changes in a spiropyran/BaFCl:Eu2+/polystryrene composite film and nonwoven fabric
      Author : Hayato Tsuchida, Ryotaro Nakamura, Kenji Kinashi, Wataru Sakai, Naoto Tsutsumi, Makoto Ozaki, Takahiro Okabe
      Journal : New J. Chem.
      Publication Date : 2016/08
      Volume,Number,Page : 40(10), pp.8658-8663
    • Molecular design of azo-carbazole monolithic dyes for updatable full-colour holograms
      Author : Kenji Kinashi, Takahiro Fukami, Yuki Yabuhara, Satsuki Motoishi, Wataru Sakai, Masuki Kawamoto, Takafumi Sassa and Naoto Tsutsumi
      Journal : NPG Asia Materials
      Publication Date : 2016/09
      Volume,Number,Page : 8, e311
    • Electron Dominated Grating In Triphenylamine-based Photorefractive Composite
      Author : Ha Ngoc Giang, Takafumi Sassa, Takashi Fujihara, Sho Tsujimura, Kenji Kinashi, Wataru Sakai, Naoto Tsutsumi
      Journal : J. Mater. Chem.
      Publication Date : 2016/06
      Volume,Number,Page : C, 4, pp.6822-6828
    • Fabrication of gold microstructures using negative photoresist doped with gold ions through two-photon excitation
      Author : R. Nakamura, K. Kinashi, W. Sakai, N. Tsutsumi
      Journal : Phys. Chem. Chem. Phys.,
      Publication Date : 2016/05
      Volume,Number,Page : 18, pp.17024-17028
    • Nature of enhancement in ferroelectric responses by gold nanoparticles in vinylidene fluoride and trifluoroethylene copolymer
      Author : Naoto Tsutsumi, Ryusei Kosugi, Kenji Kinashi, and Wataru Sakai
      Journal : ACS Applied Materials & Interfaces,
      Publication Date : 2016/07
      Volume,Number,Page : 8(26), pp.16816-16822
    • Characterization of Carrier Transport and Trapping in Photorefractive Polymer Composites Using Photoemission Yield Spectroscopy in Air
      Author : S. Tsujimura, T. Fujihara, T. Sassa*, K. Kinashi, W. Sakai, K. Ishibashi, N. Tsutsumi
      Journal : Macromol. Chem. Phys.,
      Publication Date : 2016/08
      Volume,Number,Page : 217, pp.1785-1791
    • Enhanced photorefractivity of a perylene bisimide-sensitized poly(4-(diphenylamino)benzyl acrylate) composite
      Author : T. V. Nguyen, K. Kinashi, W. Sakai, N. Tsutsumi
      Journal : Opt. Mater. Express
      Publication Date : 2016/05
      Volume,Number,Page : in press
    • Photorefractivity of perylene bisimide-sensitized poly(4-(diphenylamino) benzyl acrylate
      Author : T. V. Nguyen, H. N. Giang, K. Kinashi, W. Sakai, N. Tsutsumi
      Journal : Macromol. Chem. Phys.
      Publication Date : 2016/01
      Volume,Number,Page : 217, pp.25158-70
    • Spiropyran-based X-ray sensitive fiber
      Author : Kenji Kinashi, Yurika Miyamae, Ryotaro Nakamura, Wataru Sakai, Naoto Tsutsumi, Hideki Yamane, Gaku Hatsukano, Makoto Ozaki, Kazuya Jimbo, Takahiro Okabe
      Journal : Chemical Communications
      Publication Date : 2015/06
      Volume,Number,Page : Accepted
    • Enhanced photoconductivity and trapping rate through control of bulk state in organic triphenylamine-based photorefractive materials
      Author : Sho Tsujimura, Takashi Fujihara, Takafumi Sassa, Kenji Kinashi, Wataru Sakai, Koji Ishibashi, Naoto Tsutsumi
      Journal : Organic Electronics
      Publication Date : 2014/10
      Volume,Number,Page : 15, 3471-3475
    • Ferroelectric Switching of Vinylidene and Trifluoroethylene Copolymer Thin Films on Au Electrodes Modified with Self-Assembled Monolayer
      Author : Naoto Tsutsumi, Tomotaka Kitano, Kenji Kinashi, Wataru Sakai
      Journal : Materials
      Publication Date : 2014/09
      Volume,Number,Page : 7, 6367-6376
    • Photorefractive response and real-time holographic application of a poly(4-(diphenylamino)benzyl acrylate)-based composite
      Author : Ha Ngoc Giang, Kenji Kinashi, Wataru Sakai, Naoto Tsutsumi
      Journal : Polymer Journal
      Publication Date : 2014/08
      Volume,Number,Page : 46, 59-66
    • Fabrication of the silver structure through two-photon excitation by femtosecond laser
      Author : Ryotaro Nakamura, Kenji Kinashi, Wataru Sakai, Naoto Tsutsumi
      Journal : Chemical Physics Letters
      Publication Date : 2014/08
      Volume,Number,Page : 610-611, 241
    • Recent advances in photorefractivity of poly(4-diphenylaminostyrene) composites: Wavelength dependence and dynamic holographic images
      Author : Sho Tsujimura, Kenji Kinashi, Wataru Sakai, Naoto Tsutsumi
      Journal : Japanese Journal of Applied Physics
      Publication Date : 2014/07
      Volume,Number,Page : 53, 082601
    • Triphenylamine photoconductive polymers for high performance photorefractive devices
      Author : Ha Ngoc Giang, Kenji Kinashi, Sakai, Naoto Tsutsumi
      Journal : Journal of Photochemistry and Photobiology A: Chemistry
      Publication Date : 2014/07
      Volume,Number,Page : 291, 26
    • Photorefractive device using self-assembled monolayer coated indium-tin-oxide electrodes
      Author : Kenji Kinashi, Hironori Shinkai, Wataru Sakai, Naoto Tsutsumi
      Journal : Organic Electronics
      Publication Date : 2013/09
      Volume,Number,Page : 14, 2987
    • Photorefractive response and real-time holographic application of a poly(4-(diphenylamino)benzyl acrylate)-based composite
      Author : Ha Ngoc Giang, Kenji Kinahi, Wataru Sakai, Naoto Tsutsumi
      Journal : Polymer Journal
      Publication Date : 2013/08
      Volume,Number,Page : 46, 59
    • Optimization of photorefractivity based on poly(N-vinylcarbazole) composites: an approach from the perspectives of chemistry and physics
      Author : Kenji Kinashi, Yu Wang, Wataru Sakai, Naoto Tsutsumi
      Journal : Macromolecular Chemistry and Physics
      Publication Date : 2013/08
      Volume,Number,Page : 214, 1789 (Journal Cover)
    • Dynamic holographic images using poly(N-vinylcarbazole)-based photorefractive composites
      Author : Kenji Kinashi, Yu Wang, Asato Nonomura, Sho Tsujimura, Wataru Sakai, Naoto Tsutsumi
      Journal : Polymer Journal
      Publication Date : 2013/06
      Volume,Number,Page : 45, 665
    • Two-photon excitation by femtosecond laser in poly(N-vinylpyrrolidone) matrix doped with silver ions
      Author : Ryotaro Nakamura, Masao Hitomi, Kenji Kinashi, Wataru Sakai, Naoto Tsutsumi
      Journal : Chem. Phys. Lett.
      Publication Date : 2013/01
      Volume,Number,Page : 558, 62-65
    • Synthesis and Properties of Biodegradable Network Poly(ether-urethane)s from L-Lysine Triisocyanate and Poly(alkylene glycol)s
      Author : Minoru Nagata, Akito Oi, Wataru Sakai, Naoto Tsutsumi
      Journal : J. Appl. Polym. Sci.
      Publication Date : 2012/11
      Volume,Number,Page : 126, E358-E364
    • Real-time three-dimensional holographic display using a monolithic organic compound dispersed film
      Author : Naoto Tsutsumi, Kenji Kinashi, Wataru Sakai, Junichi Nishide, Yutaka Kawabe, Hiroyuki Sasabe
      Journal : Opt. Mater. Express
      Publication Date : 2012/08
      Volume,Number,Page : 2 (8), 1003-1010
    • Quickly Updatable Hologram Images Using Poly(N-vinyl Carbazole) (PVCz) Photorefractive Polymer Composite
      Author : Naoto Tsutsumi, Kenji Kinashi, Asato Nonomura, Wataru Sakai
      Journal : Materials
      Publication Date : 2012/08
      Volume,Number,Page : 5, 1477-1486
    • High-Speed Photorefractive Response Capability in Triphenylamine Polymer-Based Composites
      Author : Sho Tsujimura, Kenji Kinashi, Wataru Sakai, Naoto Tsutsumi
      Journal : Applied Physics Express
      Publication Date : 2012/06
      Volume,Number,Page : 5, 064101
    • Photorefractive Composite Based on a Monolithic Polymer
      Author : Ha Ngoc Giang, Kenji Kinashi, Wataru Sakai, Naoto Tsutsumi
      Journal : Macromolecular Chemistry and Physics
      Publication Date : 2012/05
      Volume,Number,Page : 213, 982
    • Towards Nonvolatile Memory Devices Based on Ferroelectric Polymers
      Author : Naoto Tsutsumi, Xue Bai, Wataru Sakai
      Journal : AIP Advances
      Publication Date : 2012/02
      Volume,Number,Page : 2, 012154
    • Photorefractive performance of polycarbazoylethylacrylate composite
      Author : Asato Nonomura, Wataru Sakai, Keniji Kinashi, Naoto Tsutsumi
      Journal : Polymer Photonics, and Novel Optical Technologies edited by Y. Kawabe and M. Kawase, PWC publishing
      Publication Date : 2011/04
      Volume,Number,Page : pp.91-95
    • Strategy for high performance photorefractive polymer composites
      Author : Naoto Tsutsumi, Keniji Kinashi, Wataru Sakai
      Journal : Polymer Photonics, and Novel Optical Technologies edited by Y. Kawabe and M. Kawase, PWC publishing
      Publication Date : 2011/04
      Volume,Number,Page : pp.6-10
    • Two-photon laser fabrication of three-dimensional silver microstructures with submicron scale linewidth
      Author : Naoto Tsutsumi, Kazuya Nagata, Wataru sakai
      Journal : Appl. Phys. A,
      Publication Date : 2011/04
      Volume,Number,Page : 103, pp.421?426
    • Enhanced performance of photorefractive poly(N-vinyl carbazole) composites
      Author : Naoto Tsutsumi, Akihito Dohi, Asato Nonomura, Wataru Sakai
      Journal : J. Polym. Sci. Part B: Polym. Phys.
      Publication Date : 2011/03
      Volume,Number,Page : 49, pp.414-420 (2011)
    • Recent development of biodegradable network polyesters obtained from renewable natural resources
      Author : Naoto Tsutsumi, Yoichiro Kono, Masaya Oya, Wataru Sakai, Minoru Nagata
      Journal : Clean
      Publication Date : 2008/08
      Volume,Number,Page : 36(8), pp.682-686
    • Synthesis and Properties of Biodegradable Network Poly(ester-carbonate) Elastomer
      Author : Minoru Nagata, TakeruTanabe, Wataru Sakai, Naoto Tsutsumi
      Journal : Polymer
      Publication Date : 2008/03
      Volume,Number,Page : 49 (6), pp. 1506-1511
    • All-Plastic Organic Dye Laser with Distributed Feedback Resonator Structure
      Author : Naoto Tsutsumi,, Makoto Takeuchi, Wataru Sakai
      Journal : Thin Solid Films
      Publication Date : 2008/03
      Volume,Number,Page : 516 (9), pp.2783-2787

    Books etc

    • "Photodegradation and Radiation Degradation" in "Poly(lactic acid)", synthesis, structures, properties, processing, and aplications
      Author : Wataru Sakai, Naoto Tsutsumi
      Publisher : Wiley
      Publication Date : 2010/01


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