Mechanisms of gas permeation through polymer membranes: Summary technical report, January 1986--December 1989. [Poly(alkyl methacrylates), poly-(1-trimethylsylil-1-propyne), and poly(vinyl acetate)]
Considerable progress has been made in the following research projects concerned with the solution and transport of gases in glassy polymer membranes: (1) It has been found that the mechanism of gas solution and transport in some poly(alkyl methacrylates) does not undergo the change observed with many other gas/polymer systems when the temperature is lowered through Tg, the glass-transition temperature of the polymers. (2) The absence of dual-mode sorption behavior described above was attributed to the fact that the ''excess'' free volume in some glassy poly(alkyl methacrylates) is smaller than in other glass polymers. (3) The internal consistency of the dual-mode sorption model was tested and confirmed by a theoretical study of gas absorption/desorption kinetics in glassy polymers. (4) The in-plane diffusion of small fluorophore molecules in glassy poly-(1-trimethylsylil-1-propyne) membranes has been studied by means of a new technique known as laser fluorescence photobleaching recovery. (5) The solubility of H/sub 2/ in a glassy polymer poly(vinyl acetate), (PVAc), was measured for the first time at elevated pressures, in order to determine whether very small molecules also exhibit dual-mode sorption behavior.
- Research Organization:
- Syracuse Univ., NY (USA). Dept. of Chemical Engineering and Materials Science
- DOE Contract Number:
- FG02-87ER13649
- OSTI ID:
- 6182255
- Report Number(s):
- DOE/ER/13649-T1; ON: DE89011377
- Country of Publication:
- United States
- Language:
- English
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Mechanisms of gas permeation through polymer membranes
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ACETATES
ACRYLATES
ALKYNES
CARBOXYLIC ACID SALTS
CHALCOGENIDES
DIFFUSION
DOCUMENT TYPES
ELEMENTS
FLUIDS
GASES
GLASS
HYDROCARBONS
HYDROGEN
MEMBRANE TRANSPORT
MEMBRANES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
PERMEABILITY
POLYMERS
POLYVINYLS
PRESSURE DEPENDENCE
PROGRESS REPORT
PROPYNE
SOLUBILITY
SORPTION
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE DEPENDENCE