Correlations of Polyimides and Blended Polyimides for High Temperature Gas Separations

Conference · Fri Mar 01 04:00:00 EST 2002

OSTI ID:1004268

Klaehn, John R; Orme, Christopher J; Luther, Thomas A; Peterson, Eric S; Urban-Klaehn, Jagoda M

High performance polymers are of interest for high temperature gas separations, especially for the sequestration of carbon dioxide. A new family of high performance imide polymers has been identified as a successful membrane capture material. VTEC polyimides possess desired thermal properties (up to 500 °C) along with being robust and flexible even after multiple thermal cycles (up to 400 °C). Polyimides (PI) are excellent materials for high selectivity for smaller kinetic diameter gases such as H2 and CO2; however, they have low fluxes. We blended small amounts of different polymers with VTEC polyimide, which changes the fluxes. Another critical problem when working with glassy polymers is their moisture content. It has been found that water entrapped within the polymer matrix (left over from the solvent, or physisorbed) can also cause the polymer to change dramatically. Additionally presence of molecular water in the polymer’s void volume has been validated through Positron Annihilation Lifetime (PAL) spectroscopy. In this presentation, polymer characterization and gas-separation testing results will be discussed.

• Research Organization: Idaho National Laboratory (INL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC07-05ID14517
• OSTI ID: 1004268
• Report Number(s): INL/CON-09-17146
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ANNIHILATION
CARBON DIOXIDE
Carbon Dioxide separations
GASES
IMIDES
KINETICS
LIFETIME
MEMBRANES
MOISTURE
PERFORMANCE
POLYMERS
POSITRONS
SPECTROSCOPY
TESTING
THERMODYNAMIC PROPERTIES
WATER
gas separations
high performance polymers
high temperature