Research Output 1999 2016

  • 957 Citations
  • 16 h-Index
  • 46 Article
  • 15 Conference contribution
  • 2 Chapter
2016

From Macromolecular to Small-Molecular Triggers: Facile Method toward Photoinduced LCST Phase Behavior of Thermoresponsive Polymers in Mixed Ionic Liquids Containing an Azobenzene Moiety

Wang, C., Ma, X., Kitazawa, Y., Kobayashi, Y., Zhang, S., Kokubo, H. & Watanabe, M. 2016 Dec 1 In : Macromolecular Rapid Communications. 37, 23, p. 1960-1965 6 p.

Research output: Contribution to journalArticle

Polymers
Ionic liquids
Phase transitions
Temperature
Amides

Self-Assembly of Polyether Diblock Copolymers in Water and Ionic Liquids

Kobayashi, Y., Kitazawa, Y., Komori, T., Ueno, K., Kokubo, H. & Watanabe, M. 2016 Jul 1 In : Macromolecular Rapid Communications. 37, 14, p. 1207-1211 5 p.

Research output: Contribution to journalArticle

Temperature
Ethers
Water
Polyethylene oxides
Block copolymers
2015
6 Citations

Photo-healable ion gel with improved mechanical properties using a tetra-arm diblock copolymer containing azobenzene groups

Ma, X., Usui, R., Kitazawa, Y., Kokubo, H. & Watanabe, M. 2015 Nov 5 In : Polymer. 78, p. 42-50 9 p.

Research output: Contribution to journalArticle

Gels
Ions
Sols
Azobenzene
Block copolymers
2 Citations

Temperature and light-induced self-assembly changes of a tetra-arm diblock copolymer in an ionic liquid

Ma, X., Usui, R., Kitazawa, Y., Kokubo, H. & Watanabe, M. 2015 Nov 1 In : Polymer Journal. 47, 11, p. 739-746 8 p.

Research output: Contribution to journalArticle

Temperature
Block copolymers
Polyethylene glycols
Micellization
Micelles
2014

Ion gels for ionic polymer actuators

Watanabe, M., Imaizumi, S., Yasuda, T. & Kokubo, H. 2014 Jul 1 Soft Actuators: Materials, Modeling, Applications, and Future Perspectives. Springer Japan, Vol. 9784431547679, p. 141-156 16 p.

Research output: Chapter in Book/Report/Conference proceedingChapter

Polymers
Actuators
Ionic liquids
Ions
Durability
2013
4 Citations

Alternating copolymer based on sulfonamide-substituted phenylmaleimide and vinyl monomers as polymer electrolyte membrane

Yasuda, T., Okimura, Y., Oishi, A., Kokubo, H. & Watanabe, M. 2013 May 15 In : Journal of Polymer Science, Part A: Polymer Chemistry. 51, 10, p. 2233-2242 10 p.

Research output: Contribution to journalArticle

Membranes
Ethers
Ion exchange
Electrolytes
Gels
2 Citations

Effects of carbon electrode materials on performance of ionic polymer actuators having electric double-layer capacitor structure

Kokubo, H., Honda, T., Imaizumi, S., Dokko, K. & Watanabe, M. 2013 Oct 1 In : Electrochemistry. 81, 10, p. 849-852 4 p.

Research output: Contribution to journalArticle

Electrodes
Carbon
Actuators
Gels
Composite materials
16 Citations

Printable polymer actuators from ionic liquid, soluble polyimide, and ubiquitous carbon materials

Imaizumi, S., Ohtsuki, Y., Yasuda, T., Kokubo, H. & Watanabe, M. 2013 Jul 10 In : ACS Applied Materials and Interfaces. 5, 13, p. 6307-6315 9 p.

Research output: Contribution to journalArticle

Actuators
Polymers
Carbon
Polyimides
Electrolytes
9 Citations

Thermoreversible nanogel shuttle between ionic liquid and aqueous phases

Ueki, T., Sawamura, S., Nakamura, Y., Kitazawa, Y., Kokubo, H. & Watanabe, M. 2013 Nov 12 In : Langmuir. 29, 45, p. 13661-13665 5 p.

Research output: Contribution to journalArticle

Temperature
Ionic liquids
Polyethylene oxides
Phase behavior
Block copolymers
2012
32 Citations

Driving mechanisms of ionic polymer actuators having electric double layer capacitor structures

Imaizumi, S., Kato, Y., Kokubo, H. & Watanabe, M. 2012 Apr 26 In : Journal of Physical Chemistry B. 116, 16, p. 5080-5089 10 p.

Research output: Contribution to journalArticle

Polyethers
Polymers
Actuators
Electrolytes
Positive ions
66 Citations

Polymer actuators using ion-gel electrolytes prepared by self-assembly of ABA-triblock copolymers

Imaizumi, S., Kokubo, H. & Watanabe, M. 2012 Jan 10 In : Macromolecules. 45, 1, p. 401-409 9 p.

Research output: Contribution to journalArticle

Gels
Ions
Polystyrenes
Polymethyl methacrylates
Actuators
2011
32 Citations

Structural effects of polyethers and ionic liquids in their binary mixtures on lower critical solution temperature liquid-liquid phase separation

Kodama, K., Tsuda, R., Niitsuma, K., Tamura, T., Ueki, T., Kokubo, H. & Watanabe, M. 2011 Mar 1 In : Polymer Journal. 43, 3, p. 242-248 7 p.

Research output: Contribution to journalArticle

Ionic liquids
Temperature
Polyethers
Phase behavior
Phase separation
1 Citations
Conjugated polymers
Polymers
Monomers
X ray diffraction
2010

Development of a polymer actuator utilizing ion-gel as electrolyte

Kokubo, H. & Watanabe, M. 2010 Dec 1 Next-Generation Actuators Leading Breakthroughs. Springer London, p. 315-328 14 p.

Research output: Chapter in Book/Report/Conference proceedingChapter

Gels
Actuators
Ions
Polymers
Electrodes
2009
17 Citations

Development of a soft actuator using a photocurable ionic gel

Saito, S., Katoh, Y., Kokubo, H., Watanabe, M. & Maruo, S. 2009 Mar 16 In : Journal of Micromechanics and Microengineering. 19, 3, 035005

Research output: Contribution to journalArticle

Actuators
Gels
Air
Position control
Real time control
43 Citations

Lower critical solution temperature phase behavior of linear polymers in imidazolium-based ionic liquids: Effects of structural modifications

Kodama, K., Nanashima, H., Ueki, T., Kokubo, H. & Watanabe, M. 2009 Mar 17 In : Langmuir. 25, 6, p. 3820-3824 5 p.

Research output: Contribution to journalArticle

Polymers
Ionic liquids
Phase behavior
Temperature
Chain length
28 Citations

Photoisomerization-induced tunable LCST phase separation of azobenzene-containing polymers in an ionic liquid

Ueki, T., Yamaguchi, A., Ito, N., Kodama, K., Sakamoto, J., Ueno, K., Kokubo, H. & Watanabe, M. 2009 Aug 18 In : Langmuir. 25, 16, p. 8845-8848 4 p.

Research output: Contribution to journalArticle

Temperature
Polymers
Ionic liquids
Phase separation
Photochromism
7 Citations

Two-photon excited states in charge-transfer type conjugated polymers

Kishida, H., Hirota, K., Okamoto, H., Kokubo, H. & Yamamoto, T. 2009 May 1 In : Synthetic Metals. 159, 9-10, p. 868-870 3 p.

Research output: Contribution to journalArticle

Photons
Excited states
Charge transfer
Polymers
Conjugated polymers
2008
16 Citations

Anionic polymerization of methyl methacrylate in an ionic liquid

Kokubo, H. & Watanabe, M. 2008 Dec 1 In : Polymers for Advanced Technologies. 19, 10, p. 1441-1444 4 p.

Research output: Contribution to journalArticle

Lithium
Anionic polymerization
Ionic liquids
Polymerization
Temperature
12 Citations

Continuous control of third-order optical nonlinearity in charge-transfer-type conjugated polymers

Kishida, H., Hirota, K., Okamoto, H., Kokubo, H. & Yamamoto, T. 2008 Feb 1 In : Applied Physics Letters. 92, 3, 033309

Research output: Contribution to journalArticle

Charge transfer
Polymers
Conjugated polymers
Thiophene
Harmonic generation

Development of microactuators using photopatternable ionic gel

Saito, S., Kato, Y., Kokubo, H., Watanabe, M. & Maruo, S. 2008 Dec 1 2008 International Symposium on Micro-NanoMechatronics and Human Science, MHS 2008. p. 188-191 4 p. 4752447

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Microactuators
Actuators
Gels
Protective atmospheres
Position control
56 Citations

LCST-type liquid-liquid phase separation behaviour of poly(ethylene oxide) derivatives in an ionic liquid

Tsuda, R., Kodama, K., Ueki, T., Kokubo, H., Imabayashi, S. I. & Watanabe, M. 2008 Dec 1 In : Chemical Communications. 40, p. 4939-4941 3 p.

Research output: Contribution to journalArticle

Liquids
Ionic liquids
Phase separation
Phase behavior
Polyethylene oxides
2007
4 Citations

Effect of core-shell micelle formation on the redox properties of phenothiazine-labeled poly(ethyl glycidy ether)-block-poly(ethylene oxide)

Tsuda, R., Kaino, S., Kokubo, H., Imabayashi, S. I. & Watanabe, M. 2007 Apr 15 In : Colloids and Surfaces B: Biointerfaces. 56, 1-2, p. 255-259 5 p.

Research output: Contribution to journalArticle

Micelles
Polymers
Temperature
Micellization
Polyethylene oxides
14 Citations

Electron-nuclear double-resonance observation of spatial extent of polarons in polythiophene and poly(3-alkylthiophene)

Kuroda, S. I., Marumoto, K., Sakanaka, T., Takeuchi, N., Shimoi, Y., Abe, S., Kokubo, H. & Yamamoto, T. 2007 Feb 19 In : Chemical Physics Letters. 435, 4-6, p. 273-277 5 p.

Research output: Contribution to journalArticle

Polymers
Polarons
Thiophene
Electrons
Oligomers
2006

Development of anionic polymerization reaction in an ionic liquid

Kokubo, H. & Watanabe, M. 2006 Dec 1 Polymer Preprints, Japan. 2 ed. Vol. 55

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ionic liquids
Anionic polymerization
Polystyrenes
Molecular weight
Cationic polymerization

Effect of ionic liquid structures on the performance of EAP actuators using ion-gel electrolytes

Kato, Y., Honda, T., Kokubo, H. & Watanabe, M. 2006 Oct 19 Polymer Preprints, Japan. 1 ed. Vol. 55

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electroactive polymer actuators
Ionic liquids
Electrolytes
Gels
Capacitors

Performance of EAP actuators using polymer gels containing ionic liquids

Kato, Y., Honda, T., Kokubo, H. & Watanabe, M. 2006 Dec 1 Polymer Preprints, Japan. 2 ed. Vol. 55, p. 4135-4136 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ionic liquids
Actuators
Gels
Ions
Electrodes
7 Citations

Specific charge transport in ionic liquids and ion gels and the importance in material science

Kawano, R., Tokuda, H., Katakabe, T., Nakamoto, H., Kokubo, H., Imabayashi, S. I. & Watanabe, M. 2006 Jan 1 In : Kobunshi Ronbunshu. 63, 1, p. 31-40 10 p.

Research output: Contribution to journalArticle

liquid
electrolyte
conductivity
gel
polymer

Structural change of polyhexylthiophene ultra-thin films by heat-treatment

Sasaki, S., Kurosawa, T., Kobayashil, N., Sato, T., Yamamoto, T. & Kokubo, H. 2006 Oct 19 Polymer Preprints, Japan. 1 ed. Vol. 55

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Heat treatment
Ultrathin films
Spin coating
Pyrolysis
Surface roughness

Surface properties of thiol-terminated thermo-sensitive polymers immobilized on gold

Kakikawa, H., Inoue, S., Kokubo, H., Imabayashi, S. I. & Watanabe, M. 2006 Oct 19 Polymer Preprints, Japan. 1 ed. Vol. 55

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Temperature
Contact angle
Gold
Substrates
Phase separation
1 Citations

Synthesis of metal complex-thermosensitive polyether hybrids and their thermosensitive and redox properties

Tsuda, R., Kokubo, H., Imabayashi, S. I. & Watanabe, M. 2006 Oct 19 Polymer Preprints, Japan. 1 ed. Vol. 55

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polyethers
Metal complexes
Coordination reactions
Anionic polymerization
Ring opening polymerization
45 Citations

Synthesis of new thiophene-based π-conjugated polymers for investigation of molecular alignment on the surface of platinum plate

Kokubo, H., Sato, T. & Yamamoto, T. 2006 May 30 In : Macromolecules. 39, 11, p. 3959-3963 5 p.

Research output: Contribution to journalArticle

Conjugated polymers
Molecular orientation
Substrates
Platinum
Polymers

Synthesis of thermosensitive polyether - Gold nanoparticle hybrids connected via terpyridine metal complexes and their thermosensitive optical and redox properties

Tsuda, R., Kokubo, H., Imabayashi, S. I. & Watanabe, M. 2006 Dec 1 Polymer Preprints, Japan. 2 ed. Vol. 55

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polyethers
Gold
Nanoparticles
Temperature
Bearings (structural)
2005

Effect of carbon electrode materials on the performance of EAP actuators based on ion gel electrolytes

Honda, T., Nanjo, S., Tabata, S., Kokubo, H. & Watanabe, M. 2005 Dec 1 Polymer Preprints, Japan. 2 ed. Vol. 54, p. 4577-4578 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electroactive polymer actuators
Electrodes
Carbon
Ions
Gels
18 Citations
Polymers
Conjugated polymers
Organometallics
Molecular weight
Oxidation

Immobilization of thiol-terminated new thermo-sensitive polymer to gold substrates and properties of the polymer modified substrate

Kakikawa, H., Inoue, S., Nakadan, N., Kokubo, H., Imabayashi, S. I. & Watanabe, M. 2005 Dec 1 Polymer Preprints, Japan. 1 ed. Vol. 54

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ethers
Substrates
Gold
Contact angle
Polymers
10 Citations
Paraffins
Vacuum
Substrates
Molecular orientation
X ray diffraction

Optical and electrical properties of polythiophene with alkynyl substituent

Sato, T., Kokubo, H. & Yamamoto, T. 2005 Dec 1 Polymer Preprints, Japan. 2 ed. Vol. 54, p. 2865-2866 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polymers
Monomers
Polycondensation
Palladium
Electric properties
1 Citations

Preparation and Properties of polythiophenes with alkynyl substituent

Sato, T., Kokubo, H. & Yamamoto, T. 2005 Dec 1 Polymer Preprints, Japan. 1 ed. Vol. 54

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polymers
Organic polymers
Thiophene
Polycondensation
Field effect transistors

Structural evaluation of polyhexylthiophene ultra-thin films by X-ray reflectivity measurements

Sasaki, S., Kurosawa, T., Kobayashi, N., Yamamoto, T. & Kokubo, H. 2005 Dec 1 Polymer Preprints, Japan. 2 ed. Vol. 54

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Surface roughness
X rays
Ultrathin films
Spin coating
Polymer films
4 Citations
Conjugated polymers
Thiophene
Polycondensation

Synthesis of water-soluble block copolymers containing a new thermosensitive segment with a terminal redox group and their solution properties

Kaino, S., Araki, S., Ogura, M., Nakadan, N., Kokubo, H., Imabayashi, S. & Watanabe, M. 2005 Dec 1 Polymer Preprints, Japan. 1 ed. Vol. 54

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Block copolymers
Ring opening polymerization
Polyethylene oxides
Sol-gels
Ethers
5 Citations

Third-order nonlinear optical spectroscopy in charge-transfer type conjugated polymers

Kishida, H., Hirota, K., Wakabayashi, T., Okamoto, H., Lee, B. L., Kokubo, H. & Yamamoto, T. 2005 Sep 21 In : Synthetic Metals. 153, 1-3, p. 141-144 4 p.

Research output: Contribution to journalArticle

Charge transfer
Electrons
Molecules
Optical materials
Conjugated polymers
37 Citations

Third-order optical nonlinearity in regio-controlled polythiophene films

Kishida, H., Hirota, K., Wakabayashi, T., Okamoto, H., Kokubo, H. & Yamamoto, T. 2005 Sep 19 In : Applied Physics Letters. 87, 12, p. 1-3 3 p., 121902

Research output: Contribution to journalArticle

Scaling laws
Dipole moment
Harmonic generation
Energy gap
Polymers

Third-order optical nonlinearity in the electronic-states-controlled and the chain-structure-controlled conjugated polymers

Kishida, H., Okamoto, H., Kokubo, H. & Yamamoto, T. 2005 Dec 1 Polymer Preprints, Japan. 2 ed. Vol. 54, p. 2925-2926 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Conjugated polymers
Excited states
Polymers
Dipole moment
Electronic states
2004
82 Citations

Alignment and field-effect transistor behavior of an alternative π-conjugated copolymer of thiophene and 4-alkylthiazole

Yamamoto, T., Kokubo, H., Kobashi, M. & Sakai, Y. 2004 Nov 16 In : Chemistry of Materials. 16, 23, p. 4616-4618 3 p.

Research output: Contribution to journalArticle

Copolymers
Thiophene
Field effect transistors
Substrates
Charge transfer
9 Citations

Electrochemical behavior of poly(3-hexylthiophene). Controlling factors of electric current in electrochemical oxidation of poly(3-hexylthiophene)s in a solution

Yamamoto, T., Honda, Y., Sata, T. & Kokubo, H. 2004 Mar 1 In : Polymer. 45, 6, p. 1735-1738 4 p.

Research output: Contribution to journalArticle

Electrochemical oxidation
Electric currents
Molecular weight
Cyclic voltammetry
Anodes
15 Citations

Third-order optical nonlinearity in charge-transfer-type conjugated polymers

Kishida, H., Hirota, K., Wakabayashi, T., Lee, B. L., Kokubo, H., Yamamoto, T. & Okamoto, H. 2004 Sep 1 In : Physical Review B - Condensed Matter and Materials Physics. 70, 11

Research output: Contribution to journalArticle

Charge transfer
Electrons
Conjugated polymers
Thiophene
Harmonic generation
2003
7 Citations
Organometallics
Copolymerization
Thiophene
Aromatic compounds
Polymerization