| abstract |
The present invention provides a new mechanochromic material suitable for use in visually detecting a damage state by reversibly visualizing a mechanical stimulus. A mechanochromic structure comprising a urethane structure in which a diarylbibenzofuranone structure represented by the following formula (1) is urethane-bonded or ester-bonded via a site X or an ester structure as a repeating unit. material. [Selection] Figure 3 |