Self-diffusion of tris-naphthylbenzene near the glass transition temperature |
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Authors: | Swallen Stephen F Bonvallet Paul A McMahon Robert J Ediger M D |
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Affiliation: | Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA. |
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Abstract: | We present a direct measurement of self-diffusion of a single-component glass-forming liquid at the glass transition temperature. Forward recoil spectrometry is used to measure the concentration profiles of deuterio and protio 1,3-bis-(1-naphthyl)-5-(2-naphthyl)benzene (TNB) following annealing-induced diffusion in a vapor-deposited bilayer. These experiments extend the range of measured diffusion coefficients in TNB by 6 orders of magnitude. The results indicate a decoupling of translational diffusion coefficients from viscosity or rotation. At T(g), D(T) is 400 times larger than expected from the Stokes-Einstein equation. |
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