Diffusion of gas molecules in the polystyrene matrix
β Scribed by Ting Wang; Dieter W. Heermann; Jean-Claude Heilig
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 175 KB
- Volume
- 9
- Category
- Article
- ISSN
- 1022-1344
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π SIMILAR VOLUMES
Over the temperature range of 20 to 90Β°C, the equilibrium solubility of methane or argon in a star-branched polystyrene-polybutadiene ( SB ) block copolymer can be reliably estimated from a volume-fraction-weighted average of the homopolymer solubilities; the value of heat of solution for SB block c
## Abstract To be able to control composition structure in gradient polymers prepared by sequential polymerization, diffusion phenomena has to be considered, particularly for the first 100% weight increment in a glassy polymer matrix. With that purpose, an analytical model to predict diffusion in t
The development of a new model for the diffusion of gas molecules in glassy polymers is presented which utilizes concepts from free volume theory and relies on a dual-mode interpretation of sorptive dilation in glassy polymers. Three assumptions are made in the development of the model. First, the f
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