The relationships between the chemical structure, packing density (1/V F ), and cohesive energy density (CED) and the thermal properties of polyimides were investigated. Particularly, the correlation of tan d measured by stress-strain/thermal mechanical analysis with 1/V F and CED was found for eigh
Calculation of the diffusion coefficient of dilute gases and of the self-diffusion coefficient of dense gases
β Scribed by John C. Slattery; R. Byron Bird
- Publisher
- American Institute of Chemical Engineers
- Year
- 1958
- Tongue
- English
- Weight
- 680 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0001-1541
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Poly(methacrylonitrile) (PMAN) samples in the shape of a cylinder used in this study were obtained from methacrylonitrile by bulk polymerization. The electron spin resonance (ESR) method has been used to calculate oxygen diffusion coefficient (D) into PMAN samples exposed to high-energy radiation at
## Abstract The freeβvolume theory of diffusion is used to predict the effect of the glass transition on the concentration dependence of the solvent selfβdiffusion coefficient at constant temperature. The theoretical prediction is in agreement with experimental data. Β© 2003 Wiley Periodicals, Inc.