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Rapid Commun."],"published-print":{"date-parts":[[2020,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The development of polymers with built\u2010in sensors that provide readily perceptible optical warning signs of mechanical events has received considerable interest. A simple and versatile concept to bestow polymers with mechanochromic behavior is the incorporation of dye\u2010filled microcapsules. Such capsules release their cargo when their shell is damaged, and the dye is subsequently activated through a chemical or physical change that causes a chromogenic response. Here, we report the preparation of fluorescent poly(urea\u2010formaldehyde) microcapsules containing solutions of a solvatochromic cyanostilbene dye and their integration in different polymers. When objects made from such composites are damaged, the dye solution is released from the containers, diffuses into the matrix, and the solvent evaporates. As a result, the polarity around the dye molecules changes, and this leads to a change of the fluorescence color. Alternatively, the dye is blended into the polymer matrix, microcapsules are loaded with a solvent, and the release of the latter triggers the color change. Both mechanisms afford ratiometric signals because the capsules that remain intact or dye molecules that are not exposed to the solvent can be used as a built\u2010in reference; therefore, a quantitative assessment of the damage inflicted on the material is a priori possible.<\/jats:p>","DOI":"10.1002\/marc.201900654","type":"journal-article","created":{"date-parts":[[2020,3,5]],"date-time":"2020-03-05T14:51:16Z","timestamp":1583419876000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["Mechanochromic Polymers Based on Microencapsulated Solvatochromic Dyes"],"prefix":"10.1002","volume":"41","author":[{"given":"C\u00e9line","family":"Calvino","sequence":"first","affiliation":[{"name":"Adolphe Merkle Institute University of Fribourg  Chemin des Verdiers 4 Fribourg CH\u20101700 Switzerland"},{"name":"Pritzker School of Molecular Engineering University of Chicago  5640 S. 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