Experimental, theoretical, and computational image analyses are presented to investigate the transport-morphology relation for small gaseous penetrants (CO//2, O//2, N//2) in mechanical blends of polystyrene and polybutadiene. The overall transport process appears non-Fickian, even though both pure phases exhibit Fickian behavior. An explanation of this phenomenon, based solely on morphological effects, is presented and tested by means of numerical experiments which mimic transient sorption in randomly interspersed media. A conclusion of the study is that the different methods usually taken as equivalent, to compute the effective diffusion coefficient from sorption data, can give significantly different results.
|Original language||English (US)|
|Journal||Annual Meeting - American Institute of Chemical Engineers|
|State||Published - Dec 1 1984|
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