Details

Autor(en) / Beteiligte

• Li, Jun
• Shiraki, Tomohiro
• Hu, Bin
• Wright, Roger A. E
• Zhao, Bin
• Moore, Jeffrey S

Titel

Mechanophore Activation at Heterointerfaces

Ist Teil von

• Journal of the American Chemical Society, 2014-11, Vol.136 (45), p.15925-15928

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2014

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Silica nanoparticles grafted with poly(methyl acrylate) (PMA) chains anchored by a maleimide–anthracene 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.