The permeability coefficient of a type of small gas molecule in a polymer is dependent on absolute
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The permeability coefficient of a type of small gas molecule in a polymer is dependent on absolute temperature according to the following equation:
Whereand Qp are constants for a given gas-polymer 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 (cm3STP)/cm2-s]at 350 K? For this diffusion system,
PM0 = 9.0 × 10-5 (cm3 STP) (cm) / (cm2 -s-Pa
Qp = 42,300 J/mol
Assume a condition of steady-state diffusion?
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Related Book For
Materials Science and Engineering An Introduction
ISBN: 978-1118324578
9th edition
Authors: William D. Callister Jr., David G. Rethwisch
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