Kim, Tae Ann Lamuta, Caterina Kim, Ho jun Leal, Cecilia Sottos, Nancy R. 2024-01-19T18:01:05Z 2024-01-19T18:01:05Z 2021-09-04 2020-04 2198-3844 https://pubs.kist.re.kr/handle/201004/118821 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. English Wiley-VCH Verlag Interfacial Force-Focusing Effect in Mechanophore-Linked Nanocomposites Article 10.1002/advs.201903464 1 Advanced Science, v.7, no.7 Advanced Science 7 7 Y scie scopus 000516067600001 2-s2.0-85080080833 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article POLYMER ACTIVATION COMPOSITES SILYLATION SURFACE SILICA BONDS force focusing interfacial effects mechanophores nanocomposites