Journal
MACROMOLECULES
Volume 52, Issue 23, Pages 9376-9382Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.9b02089
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Funding
- National Key Research and Development Program of China [2017YFA0207800, 2017YFA0204503]
- National Natural Science Foundation of China [217340062, 21522405, 21975178]
- Thousand Youth Talents Plan
- Natural Science Foundation of Tianjin [17JCJQJC44200]
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1,2-Dioxetane is a chemiluminescent mechanophore that allows the study of bond scission events with high sensitivity and resolution. We now make use of this mechanoluminescent probe to give a microscopic view of self-healing behaviors. Herein, a series of robust polyurethanes, with 1,2-dioxetane and aliphatic disulfide incorporated in the main chain and confined in the hard microphase, are developed. Taking advantage of the phase-locked bonds design strategy, these polymers exhibit excellent mechanical properties and self-healing capability as well as sensitive responsiveness to stress. With covalently embedded 1,2-dioxetane, the mechanoluminescent intensity from the healable films is highly dependent on the healing process, which provides a sensitive approach to supervise healing efficiency, particularly at the molecular level. By combining self-healing and self-reporting moieties in one chain, this two-in-one strategy allows for the discrimination of different healing mechanisms, in the aspects of bond formation and chain entanglement, in a visualized way.
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