Mechanoluminescent imaging of Osmotic stress-induced damage in a glassy polymer network

J.M. Clough, J. van der Gucht, R.P. Sijbesma

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Abstract

A chemiluminescent mechanophore, bis(adamantyl-1,2-dioxetane), is used to investigate the covalent bond scission resulting from the sorption of chloroform by glassy poly(methyl methacrylate) (PMMA) networks. Bis(adamantyl)-1,2-dioxetane units incorporated as cross-linkers underwent mechanoluminescent scission, demonstrating that solvent ingress caused covalent bond scission. At higher cross-linking densities, the light emission took the form of hundreds of discrete bursts, widely varying in intensity, with each burst composed of 107–109 photons. Camera imaging indicated a relatively slow propagation of bursts through the material and permitted analysis of the spatial correlation between the discrete bond-breaking events. The implications of these observations for the mechanism of sorption and fracture are discussed.
Original languageEnglish
Pages (from-to)2043-2053
Number of pages11
JournalMacromolecules
Volume50
Issue number5
DOIs
Publication statusPublished - 14 Mar 2017

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