Visual Indication of Mechanical Damage Using Core–Shell Microcapsules
2011; American Chemical Society; Volume: 3; Issue: 12 Linguagem: Inglês
10.1021/am201048a
ISSN1944-8252
AutoresSusan A. Odom, Aaron C. Jackson, Alex M. Prokup, Sarut Chayanupatkul, Nancy R. Sottos, Scott R. White, Jeffrey S. Moore,
Tópico(s)Advanced Polymer Synthesis and Characterization
ResumoWe report a new core-shell microcapsule system for the visual detection of mechanical damage. The core material, 1,3,5,7-cyclooctatetraene, is a conjugated cyclic olefin and a precursor to intensely colored polyacetylene. A combination of poly(urea-formaldehyde) and polyurethane is required to effectively encapsulate the volatile core material. Increasing the outer shell wall thickness and including a core-side prepolymer improves the thermal stability and free-flowing nature of these capsules, which tend to leach and rupture with thinner shell walls. Capsules ruptured in the presence of the Grubbs-Love ruthenium catalyst show immediate color change from nearly colorless to red-orange and dark purple over time, and color change in thin films resulted from scratch damage.
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