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The self‐diffusion of benzene, toluene, and ethylbenzene in polystyrene have been analyzed using the Vrentas/Duda free‐volume diffusion model. Diffusion coefficient predictions suggest an exponential concentration dependence of the activation energy required to overcome attractive forces, E. Without the use of any diffusion data approximating E as zero over the entire concentration range yields self‐diffusion coefficient predictions which are in good agreement with experimental data.
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Zielinski et al. (1992) studied this question.
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