New highly phosphonated polysulfone membranes for PEM fuel cells

Abu-Thabit, Nedal Y.; Ali, Shaikh A.; Zaidi, S. M. Javaid

doi:10.1016/j.memsci.2010.04.041

Cited by 74 publications

(49 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For this, other alternatives were investigated; the use of other sulfonated polymers such as the sulfonated poly ether ketone (SPEEK) [5] or the use of a proton donor 1 The article is published in the original. polymer such as the polybenzimidazole (PBI) [6]. Another alternative was also investigated; the use of a composite formed by a matrix blended with a proton donor material such as a carboxylic acid.…”

Section: Introductionmentioning

confidence: 99%

Conductivity and dielectric relaxation in crosslinked PVA by oxalic and citric acids

et al. 2015

View full text Add to dashboard Cite

In this work we investigated polyvinyl alcohol films which we crosslinked at various crosslinking degrees by oxalic and citric acids for the fuel cell applications. We studied the effects of the crosslinking on structure, thermal properties, electric conductivity and dielectric relaxations. The glass transition tempera ture is increased indicating the lowering of the local mobility of the polymer chains. X ray diffraction showed the presence of non dissociated acid phases in dried samples. The Dc conductivity increases by increasing both the relative humidity and the temperature obeying to an Arrhenius law with activation energy compatible with proton conductivity type. The Ac conductivity studied between 10 -1 Hz and 1 MHz showed a power law response in the high frequency range. This behavior characterizes the charge transport in disordered materi als. At low frequencies the Ac conductivity is governed by the electrode/sample interface polarization. The use of the dielectric permittivity indicates the presence of a relaxation process attributed to electrode/sample interface polarization and another relaxation process attributed to alpha relaxation of the polyvinyl alcohol chains.

show abstract

Section: Introductionmentioning

confidence: 99%

Conductivity and dielectric relaxation in crosslinked PVA by oxalic and citric acids

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The IEC is the measure of the molar equivalents of ion conductors available per unit mass of the dry polymer membrane, which can be related to the local concentration of the ion exchange sites in the polymer backbone . IEC was determined by back titration technique as reported elsewhere .…”

Section: Methodsmentioning

confidence: 99%

“…Generally, phosphonic acid‐based polymer membranes can be synthesized by two methods polymerization of phosphonated monomer or chemical grafting of phosphonic acid group to the high thermally stable polymers . It is difficult to achieve high molecular weight polymers by the polymerization method, due to the aggregation of phosphonic acid groups . The chemical grafting method appears to be convenient and advantageous to produce thermally stable phosphonated membranes .…”

Section: Introductionmentioning

confidence: 99%

“…It is difficult to achieve high molecular weight polymers by the polymerization method, due to the aggregation of phosphonic acid groups . The chemical grafting method appears to be convenient and advantageous to produce thermally stable phosphonated membranes . Several polymers such as polystyrene, poly(phenylene oxide), polyimide, and polysulfone, have been subjected to functionalization with phosphonic acid group and were used to fabricate high temperature PEM .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A synthesis study of phosphonated PSEBS for high temperature proton exchange membrane fuel cells

Elumalai

Annapooranan

Ganapathikrishnan

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

A series of novel phosphonated proton exchange membranes has been prepared using poly(styrene‐ethylene/butylene‐styrene) block copolymer (PSEBS) as base material. Phosphonic acid functionalization of the polymer was performed by a simple two‐step process, via chloromethylation of PSEBS followed by phosphonation utilizing the Michaels–Arbuzov reaction. The successful phosphonation of the polymers were characterized by NMR and Fourier transform infrared. The phosphonated ester form of the membranes were obtained by solvent evaporation method and hydrolyzed to get a proton conducting membrane. The membrane properties such as ion exchange capacity, water uptake and proton conductivity at various temperatures were examined for their suitability to be utilized as a high temperature polymer electrolyte. Additionally, the morphology, thermal, and mechanical properties of the synthesized membranes were investigated, using scanning electron microscope, thermogravimetric analysis, and tensile test, respectively. The effective (anhydrous) proton conductivity was studied with respect to various degrees of functionalization. From the studies, the membranes were found to have a comparatively good conductivity and one of the membranes reached the maximum value of 5.81 mS/cm2 at 140 °C as measured by impedance analyzer. It was found that the synthesized membranes were mechanically durable, chemically, and thermally stable. Hence, the synthesized phosphonated membranes could be a promising candidate for high temperature polymer electrolyte fuel cell applications. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45954.

show abstract

“…The reactive chloromethyl group can be readily modified by a reaction with various nucleophilic reactants. The reaction with an aliphatic phosphine (triethylphosphite in the presence of diethylcarbitol) leads to phosphonate ester groups, which can be hydrolyzed in aqueous acid to phosphonic acid pendant groups [44]. If the aliphatic phosphine is replaced with an aromatic one (triphenyl-phosphine or it derivative), the quaternary phosphonium polysulfone would also obtained [45,46].…”

Section: Functionalization Of the Bisphenol A Moietymentioning

confidence: 99%