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

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Interfacial Force‐Focusing Effect in Mechanophore‐Linked Nanocomposites

Journal article

Open access

Peer reviewed

Interfacial Force‐Focusing Effect in Mechanophore‐Linked Nanocomposites

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

Advanced science, Vol.7(7), pp.1903464-n/a

04/08/2020

DOI: 10.1002/advs.201903464

PMCID: PMC7141001

PMID: 32274322

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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 SiO 2 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. Functionalized nanoparticle interfaces enhance mechanochemical activity in solid polymers. The particles create a force‐focusing effect, causing significantly more mechanophores to activate at lower threshold strains compared to mechanophores linked directly into the polymer chain.

Communications

Communication

force focusing

interfacial effects

mechanophores

nanocomposites

Details

Title: Subtitle: Interfacial Force‐Focusing Effect in Mechanophore‐Linked Nanocomposites
Creators: Tae Ann Kim - University of Illinois Urbana-Champaign
Caterina Lamuta - University of Illinois Urbana-Champaign
Hojun Kim - University of Illinois Urbana-Champaign
Cecilia Leal - University of Illinois Urbana-Champaign
Nancy R Sottos - University of Illinois Urbana-Champaign
Resource Type: Journal article
Publication Details: Advanced science, Vol.7(7), pp.1903464-n/a
DOI: 10.1002/advs.201903464
PMID: 32274322
PMCID: PMC7141001
NLM abbreviation: Adv Sci (Weinh)
ISSN: 2198-3844
eISSN: 2198-3844
Publisher: John Wiley and Sons Inc
Grant note: ; DMR 1307354 / ;
Language: English
Date published: 04/08/2020
Academic Unit: Mechanical Engineering
Record Identifier: 9984196502702771

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