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Preparation of Proton Exchange Membranes and Lithium Batteries from Melamine-containing OrmosilsOur laboratory has recently reported a series of rodcoil polymers for lithium batteries that display dimensionally stable films with good ionic conductivity. The rod segments consist of rigid linear and branched polyimides and the coil segments are polyethylene oxides (PEO). It has been proposed that good mechanical and transport properties are due to phase separation between the rod and coil segments. It was also observed that increased branching and molecular weight lead to increased conductivity. The following study was undertaken to assess the effects of phase separation in polyalkylene oxides connected by melamine linkages. Melamine was chosen as the linking unit because it provides a branching site, cation binding sites to help ionic transport between polymer chains, and the opportunity for self assembly through hydrogen bonding. Polymers were made by the reaction of cyanuric chloride with a series of amine-terminated alkylene oxides. A linear polymer was first made, followed by reaction of the third site on cyanuric chloride with varying ratios of monofunctional Jeffamine and (3-aminopropyl)triethoxysilane. The lithium trifluoromethane sulfonamide-doped polymers are then crosslinked through a sol-gel process to form free-standing films. Initial results have shown mechanically strong films with lithium conductivities on the order of 2 x 10(exp -5) S/cm at ambient temperature. In a separate study, organically modified silanes (Ormosils) that contain sulfonic acid derivatized melamines have been incorporated into proton exchange membranes. The membranes are made by reaction of the primary amine groups of various ratios of melamine derivative and difunctional Jeffamine (MW = 2000) with the epoxide group of (3-Glycidyloxypropyl)trimethoxysilane. The films were then cross-linked through a sol-gel process. Resulting sulfuric acid doped films are strong, flexible, and have proton conductivities on the order of 2 x l0(exp -2) S/cm (120 C, 25% relative humidity). Our best results have been observed when films contain 60% PEO and 40% sulfonated melamine.
Document ID
20050203869
Acquisition Source
Glenn Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Tigelaar, Dean M.
(NASA Glenn Research Center Cleveland, OH, United States)
Kinder, James D.
(NASA Glenn Research Center Cleveland, OH, United States)
Meador, Mary Ann
(NASA Glenn Research Center Cleveland, OH, United States)
Waldecker, James
(NASA Glenn Research Center Cleveland, OH, United States)
Bennett, William R.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
September 8, 2013
Publication Date
January 1, 2004
Subject Category
Energy Production And Conversion
Meeting Information
Meeting: 2004 National Meeting of the Electrochemical Society
Location: Honolulu, HI
Country: United States
Start Date: October 3, 2004
End Date: October 8, 2004
Sponsors: Electrochemical Society, Inc.
Funding Number(s)
OTHER: 22-708-28-05
CONTRACT_GRANT: NCC3-1089
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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