Theoretical justification of reciprocal rate plots in studies of water vapor transmission through films

✍ Scribed by Dane O. Kildsig; Ronald L. Nedich; Gilbert S. Banker

• Publisher: John Wiley and Sons
• Year: 1970
• Tongue: English
• Weight: 413 KB
• Volume: 59
• Category: Article
• ISSN: 0022-3549
• DOI: 10.1002/jps.2600591119

✦ Synopsis

A theoretical equation has been developed justifying the graphical representation of vapor permeation data by l/rate versus film thickness plots. The permeability coefficient for the film may be determined from the slope of this plot and has units in square centimeters per second. The intercept at zero film thickness is dependent upon the gometry of the expeiimental design and the diffusion coefficient for the vapor within the diffusion cell. The derivation of the equation assumes a nonequilibrium condition for water vapor in the diffusion cell, as well as the existence of steadystate conditions.

Keyphrases 0 Water vapor-transmission through films 0 Film transmission-water vapor 0 Reciprocal rate plots, vapor transmission-theoretical justification 0 Polymeric, unplasticized filmswater vapor transmission

The passage of water vapor through polymer films, with reference to the free films having potential application as tablet film coatings, has been reported in the 18,457(1965).