Mechanisms of gas permeation through polymer membranes: Final report for period December 1, 1986-March 15, 1987

Technical Report · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5254081

Stern, S A

Objectives of this project are to investigate the mechanisms of transport of small molecules in and through nonporous polymer membranes, as well as the dependence of these mechanisms on polymer structure. Diffusion and permeability coefficients for Ar, CO/sub )2/), CH/sub )4/), C/sub )2/)H/sub )4/), C/sub )3/)H/sub )8/), CF/sub )4/), SF/sub )6/), and C/sub )2/)H/sub )2/)F/sub )2/) in polyethylene were determined in the temperature range from 5)degree) to 50)degree)C and at pressures up to 15-50 atm. Diffusion coefficients and solubility coefficients were determined from high-pressure absorption measurements. The coefficients were required for the determination of free-volume parameters, which were used to predict permeability coefficients by means of the free-volume model. The validity of an extension of the free-volume model of permeation to gas mixtures was tested. The ''dual-mode'' sorption model of gas transport and solution in glassy polymers has been extended to penetrantpolymer systems with concentration-dependent diffusion coefficients and to penetrants that exhibit a high solubility in glassy polymers. Two theoretical studies concerned with the dual-mode sorption model have been compeleted. A new ''generalized'' permeation model that incorporates both free-volume and dual-mode sorption concepts has been developed. Permeability, diffusion, and solubility coefficients for CH/sub )4/), C/sub )2/)H/sub )6/), and n-C/sub )4/)H/sub )10/) in poly(n-butyl methacrylate) (PnBMA) were determined at pressures up to 25 atm. and from )minus)14)degree) to 50)degree)C. 55 refs., 5 figs.

• Research Organization: Syracuse Univ., NY (USA). Dept. of Chemical Engineering and Materials Science
• DOE Contract Number: AC02-78ER05015
• OSTI ID: 5254081
• Report Number(s): DOE/ER/05015-T4; ON: DE88007322
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
400201 -- Chemical & Physicochemical Properties
ALKANES
ALKENES
ARGON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBON TETRAFLUORIDE
CHALCOGENIDES
DIFFUSION
DOCUMENT TYPES
DYNAMICS
ELEMENTS
ETHYLENE
FLUIDS
FLUORIDES
FLUORINATED ALIPHATIC HYDROCARBONS
FLUORINE COMPOUNDS
GASES
GLASS
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
MATHEMATICAL MODELS
MECHANICS
MEMBRANE TRANSPORT
MEMBRANES
METHANE
MOLECULES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
PERMEABILITY
POLYETHYLENES
POLYMERS
POLYOLEFINS
PROGRESS REPORT
PROPANE
RARE GASES
RESEARCH PROGRAMS
SOLUBILITY
SORPTION
SULFUR COMPOUNDS
SULFUR FLUORIDES
TEMPERATURE DEPENDENCE