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Heat effects in sorption of organic vapors in rubbery polymers

✍ Scribed by Ping Wang; Jerry H. Meldon; Nakho Sung

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
555 KB
Volume
59
Category
Article
ISSN
0021-8995

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✦ Synopsis

During supposedly isothermal sorption/desorption of gases or vapors by solid polymers, latent heat effects alter local temperatures with the result that diffusion behavior may appear to be non-Fickian. Even when sorption curves are seemingly Fickian, spurious values of the diffusion coefficient, D, may still be inferred. These phenomena are examined in an experimental and theoretical study of incremental sorption/desorption of acetone vapor in the fluoroelastomer, vinylidene fluoride/hexafluoropropylene copolymer. A theoretical analysis developed earlier to model water vapor sorption in wool and cellulose is shown to successfully reconcile measured mass transfer rates and temperature changes.

πŸ“œ SIMILAR VOLUMES

Sorption and diffusion of organic vapors
Sorption and diffusion of organic vapors in two fluoroelastomers
✍ Ping Wang; Nathaniel S. Schneider; Nak-Ho Sung πŸ“‚ Article πŸ“… 1999 πŸ› John Wiley and Sons 🌐 English βš– 188 KB πŸ‘ 2 views

Immersion experiments with Aflas (I), poly(tetrafluoroethylene-co-propylene), and Fluorel (II) [poly(vinylidene fluoride-co-perfluoropropylene)], showed greater swelling of I in nonpolar liquids and much higher swelling of II in polar liquids: over 100% (wt/wt) in two ketones and a phosphate ester.

Heats of water vapor sorption in swellin
Heats of water vapor sorption in swelling biopolymers
✍ Frederick A. Bettelheim; Allan Block; Leslie J. Kaufman πŸ“‚ Article πŸ“… 1970 πŸ› Wiley (John Wiley & Sons) 🌐 English βš– 491 KB πŸ‘ 1 views

## Abstract Heats of water vapor sorption by three biopolymers, polygalacturonic acid, sodium hyaluronate, and calcium salt of bovine submaxillary mucin, were determined calorimetrically. These calorimetric heats of sorption were compared with the isosteric heats of sorption as a function of water