The permeability coefficient of a type of small gas molecule in a polymer is dependent on absolute temperature according to the following equation:
where PM0 and Qp are constants for a given gaspolymer pair. Consider the diffusion of water through a polystyrene sheet 30 mm thick. The water vapor pressures at the two faces are 20 kPa and 1 kPa, which are maintained constant. Compute the diffusion flux [in(cm3 STP)/cm2•s] at 350 K? For this diffusion system,
Assume a condition of steady-state diffusion.
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