Toward broadband mechanical spectroscopy [Chemistry]
![Toward broadband mechanical spectroscopy [Chemistry]](/image/eyJ1cmkiOiJodHRwOi8vc3RhY2thZGVtaWMuaGVyb2t1YXBwLmNvbS9pbWFnZT9pbWFnZV9pZD0xMzE0OSIsImZvcm1hdCI6IndlYnAiLCJxdWFsaXR5IjoxMDAsIm5vQ2FjaGUiOnRydWV9.webp)
Diverse material classes exhibit qualitatively similar behavior when made viscous upon cooling toward the glass transition, suggesting a common theoretical basis. We used seven different measurement methods to determine the mechanical relaxation kinetics of a prototype molecular glass former over a temporal range of 13 decades and over a temperature range spanning liquid to glassy states. The data conform to time–temperature superposition for the main (alpha) process and to a scaling relation of schematic mode-coupling theory. The broadband mechanical measurements demonstrated have fundamental and practical applications in polymer science, geophysics, multifunctional materials, and other areas.
Publisher URL: http://www.pnas.org/content/114/33/8710.short
DOI: 10.1073/pnas.1707251114
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