Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 21, Pages 6168-6172Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201412413
Keywords
cross-linked polymers; dynamic covalent chemistry; gels; mechanochemistry; mechanochromism
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Funding
- Japan Society of the Promotion of Science (JSPS) [GR077]
- JSPS KAKENHI [26288057, 26620175]
- JSPS [24.7074]
- Grants-in-Aid for Scientific Research [26620175, 26288057, 26870195] Funding Source: KAKEN
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Visualization and quantitative evaluation of covalent bond scission in polymeric materials are highly important for understanding failure, fatigue, and deterioration mechanisms and improving the lifetime, durability, toughness, and reliability of the materials. The diarylbibenzofuranone-based mechanophore radical system enabled, through electron paramagnetic resonance spectroscopy, insitu quantitative evaluation of scission of the mechanophores and estimation of mechanical energy induced along polymer chains by external forces. The coagulation of polymer solutions by freezing probably generated force but did not cleave the mechanophores. On the other hand, cross-linking led to efficient propagation of the force of more than 80kJmol(-1) to some mechanophores, resulting their cleavage and generation of colored stable radicals. This mechanoprobe concept has the potential to elucidate other debated issues in the polymer field as well.
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