Mechanochromic Polymers That Turn Green Upon the Dissociation of Diarylbibenzothiophenonyl: The Missing Piece toward Rainbow Mechanochromism. Issue 13 (5th February 2018)

• Record Type: Journal Article
• Authors: Ishizuki, Kuniaki; Oka, Hironori; Aoki, Daisuke; Goseki, Raita; Otsuka, Hideyuki
• Is Part Of: Chemistry. Volume 24:Issue 13(2018)
• Page Start: 3170
• Page End: 3173
• Publication Date: 2018-02-05
• Subjects: chromism -- mechanochemistry -- mechanochromism -- polymer reactions -- radicals; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201800194
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Mechanochromic polymers, that is, polymers sensitive to mechanical impact, promise great potential for applications in damage sensors. In particular, radical‐type mechanochromic polymers, which produce colored radical species in response to mechanical stress, may enable not only the visualization of mechanical stress, but also its quantitative evaluation by electron paramagnetic resonance analysis. Herein, a radical‐type mechanochromic polymer that exhibits a color change from white to green upon dissociation of a diarylbibenzothiophenonyl moiety at the mid‐point of a polystyrene chain is presented, and its mechanochromic behavior is examined. Mechanochromic materials that show a variety of colors ("rainbow colors") in response to mechanical stress were prepared by simply mixing radical‐type mechanochromic polymers of primary colors. Abstract : Rainbow mechanochromism : A mechanochromic polymer that exhibits green color upon the dissociation of a diarylbibenzothiophenonyl unit at the mid‐point of its polymer chain is presented. Rainbow mechanochromism was achieved by mixing three different radical‐type mechanochromic polymers that exhibit blue, pink, and green color upon exposure to shear forces (see figure).