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Hayashi Lab
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A lab that expands the functions of polymer materials through mechanisms that rearrange bonds.
AboutAbout the lab
Updating polymer materials through bond exchange.
The Hayashi Lab studies new properties and functions of polymer materials through molecular design based on covalent bond exchange.
By making original polymers, measuring them, and analyzing them, the lab aims to open a path to their real-world use.
This is a newly launched lab, and it is recruiting members who will build the lab together from now on.
Key terms
- Covalent bond
- A strong bond in which atoms share electrons. It forms the backbone of polymers
- Vitrimer
- A network polymer material designed so that its bonds rearrange (bond exchange)
- Crosslinking
- Linking string-like polymer chains together like bridges to form a network
NewsLab news
Published a paper on the flow characteristics of ionenes
Published a paper on changing the physical properties of vitrimers with ionic liquids
Published a paper on fast-exchange vitrimers, in collaboration with Shinshu University
Published a co-authored paper on the viscoelasticity and friction of resins, led by Nagoya Institute of Technology
A paper on the humidity response of vitrimers and the homogenization of their networks was accepted
ResearchResearch themes
Building on covalent bond exchange (the vitrimer concept), the lab creates multifunctional polymers that will be useful in the next era. Through a consistent process of making, measuring, and analyzing, it also focuses on elucidating the mechanisms by which these functions arise.
*Illustrative imageMaking multifunctional polymers
Based on bond exchange, the lab works to create polymers with functions such as recyclability, self-healing, longer lifetime, ease of molding, and adhesives that are easy to peel off.
*Illustrative imageMolecular design of polymer networks
Focusing on crosslinked polymer networks, the lab finely controls the crosslink density and the arrangement of bond-exchange units, and designs and evaluates molecules so that the intended function is maximized.
*Illustrative imageCollaboration across fields
Working with researchers in other fields such as mechanical engineering and mechanics of materials, as well as with companies, the lab aims to go from demonstrating the functions of materials made in the lab to scaling up and establishing manufacturing processes.
MembersFaculty
The members of the Hayashi Lab are the faculty and undergraduate students.As of 2026
- Associate ProfessorMikihiro HayashiPublications ↗
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “A Problem with Polymer Theory” OLCF / CC BY 2.0 (cropped)
- Making multifunctional polymers: “Polypropylene Pellets - DPLA - f7c2fa29d14525ce21219452f4a1a316” Quantum Chemical Corporation / CC BY 4.0 (cropped)
- Molecular design of polymer networks: “Electrospun polymer nanofibers with bead-fiber morphology” Farizat Aidyn / CC BY-SA 4.0 (cropped)
- Collaboration across fields: “488 ton UWA servo hybrid injection molding machine” Mybcs1 / CC BY-SA 4.0 (cropped)
- Related lab (稲木研究室): “Portrait of Polycyanoborani” Tavo Romann / CC BY 4.0 (cropped)
- Related lab (佐藤浩太郎研究室): “Nailoni süntees 1” Thctamm / CC BY-SA 3.0 (cropped)
- Related lab (大塚研究室): “Test d'usure d'élastomère (Ifremer )” Stephane Lesbats / CC BY 4.0 (cropped)
- Related lab (中嶋・梁研究室): “Nanobouillon ( )” UCL Mathematical & Physical Sciences from London, UK / CC BY 2.0 (cropped)
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