Fracture-induced activation in mechanophore-linked, rubber toughened PMMA

Asha Dee N. Celestine, Brett A. Beiermann, Preston A. May, Jeffrey S. Moore, Nancy R. Sottos, Scott R. White

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Pages (from-to)4164-4171
Number of pages8
JournalPolymer
Volume55
Issue number16
DOIs
StatePublished - Aug 5 2014

Keywords

  • Fracture
  • Mechanophores
  • Poly(methyl methacrylate)

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

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