Journal
ADVANCED SCIENCE
Volume 7, Issue 7, Pages -Publisher
WILEY
DOI: 10.1002/advs.201903464
Keywords
force focusing; interfacial effects; mechanophores; nanocomposites
Categories
Funding
- National Science Foundation [DMR 1307354]
- Kwanjeong Educational foundation
- Korea Institute of Science and Technology
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Enhanced force transmission to mechanophores is demonstrated in polymer nanocomposite materials. Spiropyran (SP) mechanophores that change color and fluorescence under mechanical stimuli are functionalized at the interface between SiO2 nanoparticles and polymers. Successful mechanical activation of SP at the interface is confirmed in both solution and solid states. Compared with SP-linked in bulk polymers, interfacial activation induces greater conversion of SP to its colored merocyanine form and also significantly decreases the activation threshold under tension. Experimental observations are supported by finite element simulation of the interfacial stress state. The interfacial force-focusing strategy opens a new way to control the reactivity of mechanophores and also potentially indicates interfacial damage in composite materials.
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