Journal
POLYMER
Volume 55, Issue 16, Pages 4164-4171Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2014.06.019
Keywords
Mechanophores; Fracture; Poly(methyl methacrylate)
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Funding
- MURI grant from the Army Research Office [W911NF-07-1-0409]
- GOALI grant from the National Science Foundation [DMR 13-07354]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1307354] Funding Source: National Science Foundation
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Fracture-induced mechanochemical activation is achieved for the first time in a structural engineering polymer. Rubber toughened PMMA is lightly cross-linked (1.0 mol%) with the mechanophore spiropyran by free radical polymerization. Single Edge Notch Tension tests are performed on the spiropyran-linked material and a distinct change in color and fluorescence is detected at the crack tip, indicating the mechanochemical transformation of the spiropyran molecules. The degree of mechanophore activation is quantified via fluorescence imaging and is observed to increase with increasing crack length. The region of mechanophore activation correlates directly with the size of the plastic zone ahead of the crack tip. (C) 2014 Elsevier Ltd. All rights reserved.
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