Polybenzimidazole co-polymers: their synthesis, morphology and high temperature fuel cell membrane properties

2020 ◽  
Vol 11 (5) ◽  
pp. 1043-1054 ◽  
Author(s):  
Satheesh Kumar B. ◽  
Balakondareddy Sana ◽  
G. Unnikrishnan ◽  
Tushar Jana ◽  
Santhosh Kumar K. S.
Keyword(s):  
High Temperature ◽  
Fuel Cell ◽  
Cell Membrane ◽  
Dicarboxylic Acid ◽  
Terephthalic Acid ◽  
Dicarboxylic Acids ◽  
Membrane Properties ◽  
Molar Ratios

Polybenzimidazole (PBI) random co-polymers containing alicyclic and aromatic backbones were synthesized using two different dicarboxylic acids (viz., cyclohexane dicarboxylic acid and terephthalic acid) by varying their molar ratios.

Poly(Arylene Ether Sulfone) Ionomers with Different Acidity Strengths and Fuel Cell Membrane Properties

2013 ◽  
Vol 50 (2) ◽  
pp. 1031-1035
Author(s):  
Y. Chang ◽  
G. F. Brunello ◽  
M. Disabb-Miller ◽  
M. Hawley ◽  
Y. S. Kim ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Cell Membrane ◽  
Membrane Properties ◽  
Arylene Ether

Hydrocarbon-bridged Metal Complexes, LII [1]. N1,N2-Di(tert-butoxycarbonyl)-1,2,4-triaminobutane, a Useful Reagent for the Synthesis of Hydrocarbon-bridged Bis(ethylenediamine) Ligands by Reactions with Dicarboxylic Acids

2009 ◽  
Vol 64 (2) ◽  
pp. 153-158
Author(s):  
Bernhard Miller ◽  
Janina Altman ◽  
Wolfgang Beck
Keyword(s):  
Metal Complexes ◽  
Dicarboxylic Acid ◽  
Terephthalic Acid ◽  
Dicarboxylic Acids ◽  
Diacetic Acid ◽  
Tetracarboxylic Acid ◽  
Acid Dichloride

The reactions of N1,N2-Di-boc-1,2,4-triaminobutane with bridged dicarboxylic acids afford the corresponding bis-amides from which - after removal of the Boc groups - bis(N,N'-bidendate) ligands H2NCH2CH(NH2)(CH2)2NHCO-X-CONH(CH2)2CH(NH2)CH2NH2 can be obtained. New examples are the reactions of the triaminobutane with pyridine-2,6-dicarboxylic acid, with phenylene- 1,4-diacetic acid, with terephthalic acid dichloride and with benzene-1,2,4,5-tetracarboxylic acid. From the new ligands with two terminal ethylenediamine groups, the bis(dichloroplatinum) complexes were synthesized

Advancements in proton exchange membranes for high-performance high-temperature proton exchange membrane fuel cells (HT-PEMFC)

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Guoqiang Li ◽  
Wojciech Kujawski ◽  
Edyta Rynkowska
Keyword(s):  
High Temperature ◽  
Fuel Cell ◽  
High Performance ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Membrane Properties ◽  
Fluorinated Polymers ◽  
Inorganic Particles ◽  
Operation Conditions ◽  
Exchange Membrane

AbstractThe high-temperature proton exchange membrane fuel cell (HT-PEMFC) offers several advantages, such as high proton conductivity, high CO tolerance, good chemical/thermal stability, good mechanical properties, and low cost. The proton exchange membrane (PEM) is the critical component of HT-PEMFC. This work discusses the methods of current PEMs development for HT-PEMFC including modifications of Nafion® membranes and the advancement in composite PEMs based on non-fluorinated polymers. The modified Nafion®-based membranes can be used at temperatures up to 140 °C. Nevertheless, the application of Nafion®-based membranes is limited by their humidification with water molecules acting as proton carriers and, thus, by the operation conditions of membranes under a relative humidity below 20%. To obtain PEMs applied at higher temperatures under non-humidified conditions, phosphoric acid (PA) or ionic liquids (ILs) are used as proton carriers in PEMs based on non-fluorinated polymers. The research discussed in this work provides the approaches to improving the physicochemical properties and performance fuel cell of PEMs. The effects of polymer blending, crosslinking, and the incorporation of inorganic particles on the membrane properties and fuel cell performance have been scrutinized. The incorporation of inorganic particles modified with ILs might be an effective approach to designing high-performance PEMs for HT-PEMFC.

IR and 13C, 17O, and 119Sn NMR spectra of some bis(1-butyl)tin(IV) carboxylates of dicarboxylic acids

1991 ◽  
Vol 56 (9) ◽  
pp. 1908-1915 ◽  
Author(s):  
Jaroslav Holeček ◽  
Antonín Lyčka ◽  
Milan Nádvorník ◽  
Karel Handlíř
Keyword(s):  
Infrared Spectroscopy ◽  
Nmr Spectroscopy ◽  
Dicarboxylic Acid ◽  
Nmr Spectra ◽  
Dicarboxylic Acids ◽  
119Sn Nmr ◽  
Carboxylic Groups ◽  
Cyclic Oligomers ◽  
The Media ◽  
Oxygen Atoms

Infrared spectroscopy and multinuclear (13C, 17O, and 119Sn NMR spectroscopy have been used to study the structure of bis(1-butyl)tin(IV) carboxylates of dicarboxylic acids (1-C4H9)2. Sn(X(COO)2), where X = (CH2)n (n = 0-8), CH=CH (cis and trans) and C6H4 (ortho and para).The crystalline compounds are formed by linear or cyclic oligomers or polymers whose basic building units represent a grouping composed of the central tin atom substituted by two 1-butyl groups and coordinated with both oxygen atoms of two anisobidentate carboxylic groups derived from different molecules of a dicarboxylic acid. The environment of the tin atom has a shape of a trapezoidal bipyramid. When dissolvet in non-coordinating solvents, the compounds retain the oligomeric character with unchanged structure of environment of the central tin atom. In the media of coordinating solvents the bis(1-butyl)tin(IV) carboxylates of dicarboxylic acids form complexes whose central hexacoordinated tin atom binds two molecules of the solvent trough their donor atoms. Carboxylic groups form monodenate linkages in these complexes.

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