All the polymers were characterized by 1H NMR, thermogravimetric analysis (TGA), the water uptake, and proton and methanol transport for fuel cell applications. These comb-shaped sulfonated polymers had good properties as polyelectrolyte membrane materials. The comb-shaped copolymers with two or four ...
A series of sulfonated poly(aryl ether ketone) (SPAEK-6F) copolymers were prepared by aromatic nucleophilic polycondensation of hexafluoroisopropylidene diphenol with 5,5'-carbonylbis(2-fluorobenzenesulfonate) and 4,4'-difluorobenzophenone (DFBP) at various molar ratios. The synthesized SPAEK-6F po...
Rigid-rod poly(4′-phenyl-2,5-benzophenone) telechelics were synthesized by Ni(0) catalytic coupling of 2,5-dichloro-4′-phenylbenzophenone and the end-capping agent 4-chloro-4′-fluorobenzophenone. The degree of polymerization was determined by C NMR. The telechelics produced were selectively...
softens interlayer charge repulsion and yields an extremely stable framework.bReconstructed structure of one hexagonal macrocycle (grey, C; blue, N; CH3units and
A series of copolymers were studied by FT-IR, 1H NMR spectroscopy, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Sorption experiments were conducted to observe the interaction of sulfonated polymers with water and methanol. The ion exchange capacity (IEC), a measure...
All the polymers were characterized by H-1 NMR, thermogravimetric analysis (TGA), the water Uptake, and proton and methanol transport for fuel cell applications. These comb-shaped sulfonated polymers had good properties as polyelectrolyte membrane materials. The comb-shaped copolymers with two or ...
Conformational isomerism in squaraines: saturation transfer NMR studies on hydroxy squaraines The proton and 13C NMR of azulene and dialkylaminohydroxyphenyl squaraines have been investigated. The four-membered ring carbon resonances occur in the 18... PM Kazmaier,GK Hamer,RA Burt - 《Canadian Jou...
(3,5-dimethyl-4-hydroxyphenyl)-2,3- phthalazinone,4,4'-difluorobenzophenone and 3,3'-disulfonate-4,4'-difluorobenzophenone.The chemical structure of SPPEK-DMs was characterized by FTIR and ~1H-NMR.Thermal stability of SPPEK-DMs was characterized by the thermogravimetric analysis.The ...
These copolymers were prepared via nucleophilic condensation reaction of 4,4鈥 -bis(4-hydroxyphenyl) valeric acid (DPA), dichlorobenzophenone (DCDPK), and sulfonated naphthalene/sulfonated BPA monomers and characterized by FT-IR and 1H-NMR spectroscopic techniques. The crosslinking of the carboxylic ...
A series of copolymers were studied by 1H-NMR spectroscopy, differential scanning calorimeter (DSC), and thermo gravimetric analysis (TGA). Sorption experiments were conducted to observe the interaction of sulfonated polymers with water and methanol. The S-PEK membranes exhibited proton conducti...