Monitoring Fluorescence Colors to Separately Identify Cracks and Healed Cracks in Microcapsule-containing Self-healing Coating
Abstract We developed a system involving an extrinsic self-healing coating to identify cracked and healed regions by their yellow fluorescence and blue fluorescence, respectively. This system consisted of a top coating, an epoxy matrix resin containing a yellow fluorescent dye, and a microcapsule. This microcapsule in turn consisted of a healing agent, a blue aggregated-induced emitting luminogen, and a photo-initiator, as well as poly(urea-formaldehyde) as a shell material. Embedding the self-healing coating with a 25 mass% of microcapsules yielded the most efficient fluorescence detection and healing of the damaged region. Scratched and healed regions were successfully detected using our system under UV irradiation as well as under a one sun condition similar to sunlight. The blue fluorescence of the healed region was easily seen from 2m away. Highlights The detection of both the state of damage and healing of a extrinsic self-healing with two highly contrasting fluorescently emitted light. The monitoring of the damage and healing processes of the self-healing separately to understanding how the self-healing coating condition. This coating system was also successfully demonstrated under a one sun condition similar to sunlight. Graphical abstract [DISPLAY OMISSION]
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