Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 45, Pages 15925-15928Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja509949d
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Funding
- U.S. Office of Naval Research Award [N0004-13-1-0170]
- NSF [DMR-1206385]
- Japan Society for the Promotion of Science for a JAPS postdoctoral fellowship
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1206385] Funding Source: National Science Foundation
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Silica nanoparticles grafted with poly(methyl acrylate) (PMA) chains anchored by a maleimideanthracene cycloadduct were synthesized to demonstrate mechanochemically selective activation of mechanophores at heterogeneous interfaces. By quantifying the anthracene-containing cleaved PMA polymers, which are generated via retro-[4 + 2] cycloaddition reactions, the first-order kinetic coefficient was determined. Activation characteristics of mechanophores anchored to a nanoparticle exhibit behavior similar to mechanophore-linked polymers, e.g., threshold molecular weight and linear increase in rate coefficient with molecular weight above the threshold. This model system is thus valuable as a probe to test stress activation of interfacially bonded mechanophores relevant to the design of fiber-reinforced polymer composites.
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