Kenta Kokado

Research Institute for Electronic Science, Hokkaido University
Associate Professor
A01
Research AreasOrganic Chemistry, Polymer Chemistry, Supramolecular Chemistry
Participating Group (2020-2021)

Rational　design of crystal transforming behavior by using anisotropically transforming soft crystals responding to external stimuli.

Keywords
Anisotropic Transformation, Gel, Porous Crystal, Artificial Muscle, Crosslink
Co-Researcher
Co-Researcher: Kazuki Sada (Faculty of Science, Hokkaido University, Professor)

Research Outline

Polymer gels are well-known to exhibit a large volumetric change, thus many researchers have explored their application for various actuators. However, the construction of polymer gels with ordered network structure, such as muscle, is still a challenging problem in the field of polymer chemistry. The researchers will develop various polymer gels with ordered network structure derived from the crystal structure of the ingredient porous crystal, metal-organic framework (MOF). Therein, the polymer gels are obtained by crosslinking of MOF with the guest molecule followed by softening of the MOF. These polymer gels can reversibly demonstrate anisotropic transforming behavior analogous to a muscle, based on the anisotropy of the original MOF crystal. The introduction of stimuli-responsivity to the crosslinker and so on will allow us to obtain an advanced smart actuator responding to various external stimuli such as heat, light, or electric field, via a bottom-up approach.

Reversibly anisotropic transformation of a soft crystal
Participating Group (2018-2019)

Development of anisotropically transforming soft crystals with stimuli-responsivity by softening porous crystals

Keywords
Porous crystals, Crosslink, Anisotropic transformation, Stimuli-responsivity, Polymer gel
Co-Researcher
Co-Researcher: Kazuki Sada (Faculty of Science, Hokkaido University, Professor)

Research Outline

TPolymer gels are well-known to exhibit a large volumetric change, thus many researchers have explored their application for various actuators. However, the construction of polymer gels with ordered network structure, such as muscle, is still a challenging problem in the field of polymer chemistry. The researchers will develop various polymer gels with ordered network structure derived from the crystal structure of the ingredient porous crystal, metal-organic framework (MOF). Therein, the polymer gels are obtained by crosslinking of MOF with the guest molecule followed by softening of the MOF. These polymer gels can reversibly demonstrate anisotropic transforming behavior analogous to a muscle, based on the anisotropy of the original MOF crystal. The introduction of stimuli-responsivity to the crosslinker and so on will allow us to obtain an advanced smart actuator responding to various external stimuli such as heat, light, or electric field, via a bottom-up approach.

Reversibly anisotropic transformation of a soft crystal

Publications

Academic papers/reviewed

A01-11

  1. ”Swelling Behavior of Lipophilic Polyelectrolyte Gels in Organic Solvents-Water or Sea Water Binary Mixtures” X. Wang, S. Sunaga, *K. Kokado, *K. Sada, Macromol. Chem. Phys., Accepted.
    DOI: 10.1002/macp.202100505
  2. "Triple Thermoresponsiveness of a TADDOL-Based Homopolymer through the Formation of Supramolecular Complexes with Chiral Guest Molecules at Variable Ratios" M. Naya, *K. Kokado, *K. Sada, ACS Appl. Polym. Mater., 2, 4415–4424 (2020).
    DOI: 10.1021/acsapm.0c00491
  3. "Emissive Tetraphenylethylene (TPE) Derivatives in a Dissolved State Tightly Fastened by a Short Oligo(Ethylene Glycol) Chain” Y. Tanaka, T. Machida, T. Noumi, *K. Sada, *K. Kokado, Org. Chem. Front., 7, 2649-2656 (2020).
    DOI: 10.1039/D0QO00839G
  4. "Photo‐Induced Pyramidal Inversion Behavior of Phosphines Involved with the Aggregation‐Induced Emission (AIE) Behavior" T. Machida, T. Iwasa, T. Taketsugu, *K. Sada, *K. Kokado, Chem. Eur. J., 26, 8028-8034, (2020). (Front Cover) (領域内共同研究 A01公募 岩佐)
    DOI: 10.1002/chem.202000264
  5. "Metal-Organic Framework Tethering pH- and Thermo-Responsive Polymer for ON-OFF Controlled Release of the Guest Molecules" S. Nagata, *K. Kokado, *K. Sada, CrystEngComm, 22, 1106-1111, (2020).
    DOI: 10.1039/c9ce01731c
  6. "Supramolecularly Designed Thermoresponsive Polymers in Different Polymer Backbones" M. Naya, *K. Kokado, K. B. Landenberger, S. Kanaoka, S. Aoshima, *K. Sada, Macromol. Chem. Phys., 221, 1900455, (2020). (Back Cover)
    DOI: 10.1002/macp.201900455
  7. "Synthesis of pyramidal tetraarylborate pentads" N. Sakamoto, *K. Kokado, *K. Sada, New J. Chem., 43, 14853–14858 (2019).
    DOI: 10.1039/c9nJ01772k
  8. "Step-growth copolymerization between immobilized monomer and mobile monomer in metal-organic frameworks" S. Anan, Y. Mochizuki, *K. Kokado, *K. Sada, Angew. Chem. Int. Ed., 58, 8018-8023 (2019).
    DOI: 10.1002/anie.201901308
  9. "Post-synthetic Modification of Metal-Organic Framework through Urethane Formation" S. Anan, *K. Kokado, *K. Sada, Chem. Lett., 48, 285-287 (2019).
    DOI: 10.1246/cl.180955
  10. "Control of Aggregation-Induced Emission from a Tetraphenylethene Derivative through the Components in the Co-crystal" T. Jimbo, M. Tsuji, R. Taniguchi, *K. Kokado, *K. Sada, Cryst. Growth Des., 18, 3863-3869 (2018).
    DOI: 10.1021/acs.cgd.8b00141

Domestic conferences

A01-11

  • “Crystal Component Linking of Porous Crystals for Controlled Polymerization” Japan-Taiwan Bilateral Polymer Symposium 2022 (Online, Mar. 7-8, 2022)

International conferences

A01-11

  1. “Design of AIEgens from the molecular structural change in the excited state” Pacifichem2021 (Online, Dec. 16-21, 2021)
  2. Crystal Component Linking as a New Controlled Polymerization” Cooperative phenomena in framework materials: Faraday Discussion (Online, Oct. 13-16, 2020.)
Related Website(s)
Contact
kokado@es.hokudai.ac.jp