The accurate measurement of water vapor sorption and permeation in polymers is complicated because water has a tendency to adsorb on high energy surfaces, a relatively high heat of vaporization, and a high solubility in most polymers. These issues and the difficulties they cause in the design of sor
Diffusion and permeation of vapors in composite polymer thin films
β Scribed by S.A. Jenekhe; J.W. Lin
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 516 KB
- Volume
- 105
- Category
- Article
- ISSN
- 0040-6090
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The theory of the permeation of effectively spherical molecules of gases and vapors (permeants) through films of compact amorphous solids such as polymers is developed using the activated-jump model (AJM). The conventional view is that permeation has to be analyzed as the resultant of sorption (solu
Hydrogel films were prepared from hydroxyethyl methacrylate, both with (Film II) and withouth (Film I) 5.25 mole% of ethylene glycol dimethacrylate. Permeation, diffusion, and partition coefficients for progesterone, testosterone, nandrolone, norethindrone, 17 alpha-hydroxyprogesterone, estradiol, a
Missouri 65401 ## Synopsis There are two types of anomalous diffusion of vapors in solid polymers which are held to be due to swelling. If the latter is seen as strain, then there must be an accompanying stress which can affect the nature and magnitude of diffusion. The theories of diffusion in p