AbstractMutual diffusion coefficients are measured for the ethylbenzene‐polystyrene system for the temperature range of 115.5°–178°C and for concentrations as high as 70 wt‐ ethylbenzene. Experiments were carried out using a quartz spring sorption apparatus which was modified for high‐temperature measurements. The diffusivity data are compared with the predictions of a recently developed free‐volume theory of polymer‐solv
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