Interfacial Force-Focusing Effect in Mechanophore-Linked Nanocomposites

Tae Ann Kim; Caterina Lamuta; Hojun Kim; Cecilia Leal; Nancy R. Sottos

doi:10.1002/advs.201903464

Interfacial Force-Focusing Effect in Mechanophore-Linked Nanocomposites

Tae Ann Kim, Caterina Lamuta, Hojun Kim, Cecilia Leal, Nancy R. Sottos

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English (US)
Article number	1903464
Journal	Advanced Science
Volume	7
Issue number	7
DOIs	https://doi.org/10.1002/advs.201903464
State	Published - Apr 1 2020

Keywords

force focusing
interfacial effects
mechanophores
nanocomposites

ASJC Scopus subject areas

General Engineering
General Chemical Engineering
Biochemistry, Genetics and Molecular Biology (miscellaneous)
General Materials Science
General Physics and Astronomy
Medicine (miscellaneous)

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10.1002/advs.201903464

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title = "Interfacial Force-Focusing Effect in Mechanophore-Linked Nanocomposites",

abstract = "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.",

keywords = "force focusing, interfacial effects, mechanophores, nanocomposites",

author = "Kim, {Tae Ann} and Caterina Lamuta and Hojun Kim and Cecilia Leal and Sottos, {Nancy R.}",

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doi = "10.1002/advs.201903464",

language = "English (US)",

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T1 - Interfacial Force-Focusing Effect in Mechanophore-Linked Nanocomposites

AU - Kim, Tae Ann

AU - Lamuta, Caterina

AU - Kim, Hojun

AU - Leal, Cecilia

AU - Sottos, Nancy R.

PY - 2020/4/1

Y1 - 2020/4/1

N2 - 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.

AB - 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.

KW - force focusing

KW - interfacial effects

KW - mechanophores

KW - nanocomposites

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Interfacial Force-Focusing Effect in Mechanophore-Linked Nanocomposites

Abstract

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