Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 5, Pages 2680-2683Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202013180
Keywords
fluorescence; mechanochemistry; molecular probes; polymers; radicals
Categories
Funding
- JST CREST [JPMJCR1991]
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This study introduces an innovative strategy to detect mechanoradicals visually and quantitatively, using a fluorescent molecular probe that generates relatively stable radicals. Mechanoradicals generated by ball milling of polystyrene samples were successfully detected through this radical chain-transfer mechanism, enabling visualization and quantitative evaluation of mechanoradicals generated by polymer-chain scission.
Since the beginning of polymer science, understanding the influence of mechanical stress on polymer chains has been a fundamental and important research topic. The detection of mechanoradicals generated by homolytic cleavage of the polymer chains in solution has been studied in many cases. However, the detection of mechanoradicals in the bulk is still limited owing to their high reactivity. Herein, we propose an innovative strategy to detect mechanoradicals visually and quantitatively using a chain-transfer agent that generates relatively stable fluorescent radicals as a molecular probe. Mechanoradicals generated by ball milling of polystyrene samples were successfully detected by using a diarylacetonitrile compound as a fluorescent molecular probe through this radical chain-transfer mechanism. This probe enables the visualization and quantitative evaluation of mechanoradicals generated by polymer-chain scission.
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