Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 15, Pages 8406-8409Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202015196
Keywords
electron paramagnetic resonance; mechanochromism; polymer mechanochemistry; polyurethanes; self-strengthening
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Funding
- JST CREST [JPMJCR1991]
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Mechanochromic elastomers with force-induced cross-linking reactions and fluorescence properties have been successfully synthesized, demonstrating for the first time damage detection and changes in the mechanical properties of bulk elastomers induced by simple compression or extension.
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. The obtained elastomers generated CF radicals and changed color by compression or extension; they also became insoluble due to the mechanically induced cross-linking reactions. Additionally, an SPU containing diphenylmethane units also exhibited highly sensitive mechanofluorescence. To the best of our knowledge, this is the first report to demonstrate damage detection ability and changes in the mechanical properties of bulk elastomers induced by simple compression or extension.
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