Mechanochromic Dynamic Covalent Elastomers: Quantitative Stress Evaluation and Autonomous Recovery

Keiichi Imato, Takeshi Kanehara, Tomoyuki Ohishi, Masamichi Nishihara, Hirofumi Yajima, Masayoshi Ito, Atsushi Takahara, Hideyuki Otsuka

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

Stress evaluation in polymeric materials is important in order to not only spot danger in them before serious failure, but also precisely interpret the destructive mechanism, which can improve the lifetime and durability of polymeric materials. Here, we are able to visualize stress by color changes, as well as quantitatively estimate the stress in situ, in segmented polyurethane elastomers with diarylbibenzofuranone-based dynamic covalent mechanophores. We prepared films of the segmented polyurethanes, in which the mechanophores were incorporated in the soft segments, and efficiently activated them by mechanical force. Cleavage of the mechanophores during uniaxial elongation and their recovery after the removal of the stress were quantitatively evaluated by in situ electron paramagnetic resonance measurements, accompanied by drastic color changes.

Original languageEnglish
Pages (from-to)1307-1311
Number of pages5
JournalACS Macro Letters
Volume4
Issue number11
DOIs
Publication statusPublished - 2015 Nov 9
Externally publishedYes

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ASJC Scopus subject areas

  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry

Cite this

Imato, K., Kanehara, T., Ohishi, T., Nishihara, M., Yajima, H., Ito, M., Takahara, A., & Otsuka, H. (2015). Mechanochromic Dynamic Covalent Elastomers: Quantitative Stress Evaluation and Autonomous Recovery. ACS Macro Letters, 4(11), 1307-1311. https://doi.org/10.1021/acsmacrolett.5b00717