| Proton-Exchange Membranes from Sulfonated Polyphosphazene Blends |
04 APR 2003 |
13 pages |
| Authors:
Peter N. Pintauro; Ryszard Wycisk; Roy Carter; H. Yoo; J. Lee; TULANE UNIV NEW ORLEANS LA DEPT OF CHEMICAL ENGINEERING
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 | Proton-exchange membranes for direct methanol fuel cells were prepared from sulfonated polyBIS(3-METHYLPHENOXY)PHOSPHAZENE, which was blended with either Kynar (TM) Flex, polyacrylonitrite, or polybenzimidazole. In some cases the blended films were UV-crosslinked. The proton conductivity of the membranes was sufficiently high for fuel cell applications. The water swelling of the membranes was generally greater than that of Nafion 117, but the methanol crossover was lower than that of Nafion 117. Direct ... |
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| PTFE/Polyphosphazene Composite Fuel Cell Membranes |
15 MAY 2000 |
10 pages |
| Authors:
Peter N. Pintauro; TULANE UNIV NEW ORLEANS LA
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| Polyphosphazene-based cation-exchange membranes were fabricated and evaluated for possible use in proton exchange membrane (PEM), direct liquid methanol fuel cells. Two types of membranes were prepared: (1) A composite PTFE/ sulfonated-polyphosphazene membrane; and (2) homogeneous membranes composed of either a single sulfonated phosphazene polymer or blends of a sulfonated polyphosphazene and a non-sulfonated polymer. The phosphazene polymer used for all membranes was polyBIS(3-METHYLPHENOXY)PHOSPHAZENE, which was ... |
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| Polyphosphazene Membranes. I. Solid-State Photocrosslinking of Poly(4- Ethylphenoxy)(Phenoxy)Phosphazene |
15 FEB 96 |
39 pages |
| Authors:
Ryszard Wycisk; Peter N. Pintauro; Wei Wang; Sally O'Connor; TULANE UNIV NEW ORLEANS LA
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| Dense films of poly((4-ethylphenoxy)(phenoxy)phosphazene), PEPP, a potentially attractive ion-exchange membrane material, were crosslinked to varying degrees using UV light and a photoinitiator. This polymer contained two kinds of substituents: phenoxy groups to be used for possible functionalization (e.g. , sulfonation) and ethylphenoxy sidechains for photocrosslinking, where hydrogens at the benzylic carbons could be abstracted by a photoinitiator leaving macroradicals that after recombination formed covalent bonds. The polyphosphazene polymer was synthesized, ... |
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| Separation of Dilute Organic/Water Mixtures with Asymmetric Poly(vinylidene fluoride) Membranes |
93 |
53 pages |
| Authors:
K. Jian; Peter N. Pintauro; R. Poangi; TULANE UNIV NEW ORLEANS LA DEPT OF CHEMISTRY
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| An in-depth investigation of integral asymmetric poly(vinylidene fluoride) (PVDF) membranes has been carried out for the extraction of polar and non-polar organic compounds from dilute organic-in-water feed solutions. Membrane performance for low and high- boiling non-polar organic feed components was excellent, with separation factors as high as 4900 and high organic transmembrane fluxes. Polar organic feed components such as ethanol and acetone were also separated effectively from water but the ... |
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