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Diffusivity and solubility of organic vapors in modified polyethylene films. I. Technique and analysis of results
Author(s) -
AboulNasr Osman T.,
Huang Robert Y. M.
Publication year - 1979
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1979.070230622
Subject(s) - solubility , thermal diffusivity , diffusion , thermodynamics , desorption , sorption , polyethylene , absorption (acoustics) , materials science , polymer , fujita scale , volume (thermodynamics) , analytical chemistry (journal) , chemistry , chromatography , adsorption , composite material , physics , meteorology
A new method of analyzing unsteady‐state sorption data was developed to determine the diffusivity and solubility of vapors in polymer films. The equilibrium weight increase yields the solubility directly. Analysis of the unsteady‐state data gives the diffusion coefficient and its concentration dependence. A complete method for the analysis of either absorption or desorption results is presented for any type of concentration dependence of the diffusion coefficient. In this paper the method is applied to the Fujita free volume theory. The apparatus and the experimental procedures are discussed in detail.