Concentration dependence of diffusivities of penetrants in glassy polymer membranes
β Scribed by E. Sada; H. Kumazawa; J.-S. Wang
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- English
- Weight
- 321 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0021-8995
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π SIMILAR VOLUMES
Small molecules in glassy polymers are considered to occupy sites with a distribution of free energies of dissolution. Then their diffusivity depends on concentration and temperature in the same way as it has been derived for hydrogen atoms in metallic glasses. For hydrogen it was shown that the tra
## Abstract The diffusion of radioactively tagged __n__βhexadecane, __n__βdotriacontane, and a polybutadiene oligomer with molecular weight 1600 has been studied in 12 rubbery polymers. Diffusion coefficients were obtained from the theory for the thin smear method: for __n__βhexadecane and for __n_
Steady-state permeation rates for pure COz and CH4 and the binary mixture through homogeneous dense polysulfone and polycarbonate membranes have been measured at 40Β°C and upstream pressures up to 26 atm. The pressure dependence of the mean permeability coefficients for COz and CH, for all of the sys