Study of Transport Properties and Structure of Extended-Chain Polymers: Diffusion and Solubility of Gases.
Interim rept. 1 Oct 81-30 Sep 82,
VIRGINIA UNIV CHARLOTTESVILLE DEPT OF MATERIALS SCIENCE
Pagination or Media Count:
The study of the transport properties in extended chain polymers has added to the understanding of relations between their macroscopic and microscopic properties. There was a need to determine the extent to which a new class of high strength extended chain polymers absorb various vapors and how the vapor moves within the materials, which have a highly anisotropic fibrous morphology. The main polymer studied as a representative of the class is poly p-phenylene benzobisthiazole PPBT. An abnormally large heat of sorption solution and paradoxical data from two experimental systems with somewhat different conditions are attributed to a large volume fraction of microcavities in PPBT. This hypothesis was shown to be consistent by using the theory of dual sorption. A statistical mechanical model due to diBenedetto was modified to correlate the activation energy with rotation energy and to make possible the prediction of the parallel diffusion coefficient.
- *MOLECULAR STRUCTURE
- MATHEMATICAL MODELS
- TRANSPORT PROPERTIES
- HIGH STRENGTH
- DIFFUSION COEFFICIENT
- STATISTICAL ANALYSIS
- STATISTICAL MECHANICS
- ACTIVATION ENERGY
- Atomic and Molecular Physics and Spectroscopy