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Gas transport through polyethylene membranes
Author(s) -
Soles Emma,
Smith J. M.,
Parrish W. R.
Publication year - 1982
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690280316
Subject(s) - polyethylene , thermal diffusivity , diffusion , solubility , membrane , argon , chemistry , analytical chemistry (journal) , polymer , gaseous diffusion , thermodynamics , constant (computer programming) , chromatography , organic chemistry , physics , biochemistry , electrode , computer science , programming language
Transport rates were measured by monitoring the pressure decay between two reservoirs connected by a polyethylene membrane. The diffusion equation was integrated to obtain a relation between the pressure difference across the reservoirs and the time, with solubility, expressed by Henry's law constant H , and the diffusivity D as parameters. A procedure was developed whereby both H and D are evaluated from a single set of Δ p vs. t measurements. For argon in low‐density polyethylene, H and D at 323 K were 35[kg·mo]/(m 3 of gas)/[kg·mol/(m 3 of polymer)] and 2.1 × 10 −10 m 2 /s, respectively. For the high‐density sample these values were 38.7 and 1.11 × 10 −10 at 298.1 K.