Free-volume analysis of solvent self-diffusion in polymer solutions
โ Scribed by James S Vrentas; Chia-Hsi Chu
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 155 KB
- Volume
- 130
- Category
- Article
- ISSN
- 0021-9797
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๐ SIMILAR VOLUMES
The effect of solvent size on the diffusion process is studied for various solvents with natural rubber and polybutadiene in terms of the free-volume theory. The importance of energy effects on the diffusion of penetrants in rubbers is examined. The critical molar volume of the polymer jumping unit
Several versions of free-volume theory have been proposed to correlate or predict the solvent diffusion coefficient of a polymer/solvent system. The quantity of free volume is usually determined by the Williams-Landel-Ferry (WLF) equation from viscosity data of the pure component in these theories.
Variable temperature 3C nuclear magnetic resonance (NMR) spinlattice ( Tl) relaxation studies were carried out using pure ethylbenzene, tetrahydrofuran, and methanol samples. Single correlation times, determined from an isotropic rotational diffusion model, were correlated successfully using the fre