Publications by authors named "Kota Seshimo"
Segmented Polyurethane Elastomers with Mechanochromic and Self-Strengthening Functions.
Angew Chem Int Ed Engl
April 2021
Mechanochromic elastomers that exhibit force-induced cross-linking reactions in the bulk state are introduced. The synthesis of segmented polyurethanes (SPUs) that contain difluorenylsuccinonitrile (DFSN) moieties in the main chain and methacryloyl groups in the side chains was carried out. DFSN was selected as the mechanophore because it dissociates under mechanical stimuli to form pink cyanofluorene (CF) radicals, which can also initiate the radical polymerization of methacrylate monomers.
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- A new linker called difluorenylsuccinonitrile (DFSN) was designed for use in polymer networks, which can break its C-C bond under mechanical stress to form a stable pink radical.
- DFSN-based polymers show better mechanical properties compared to traditional covalently cross-linked polymers due to energy absorption during the bond cleavage process.
- The toughness of these elastomers is both visually indicated by the intensity of the pink color and quantitatively measured using electron paramagnetic resonance, highlighting that the amount of bond cleavage directly enhances the material's mechanical performance.