Water sorption of poly(vinylphosphonic acid) and its influence on proton conductivity

Kaltbeitzel, Anke; Schauff, Siri; Steininger, Hanna; Bingöl, Bahar; Brunklaus, Gunther; Meyer, Wolfgang; Spiess, Hans Wolfgang

doi:10.1016/j.ssi.2007.02.007

Cited by 93 publications

(125 citation statements)

References 19 publications

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“…A condensation reaction between the -PO3H2 groups, which has been shown previously for phosphonated polymers [18], was confirmed in the case of 5 by the 31 P-NMR.…”

Section: Phosphonation Of Poly(arylene Ether Perfluoroxylene)supporting

confidence: 80%

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Perfluoro-p-xylene as a New Unique Monomer for Highly Stable Arylene Main-Chain Ionomers Applicable to Low-T and High-T Fuel Cell Membranes

2015

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Abstract:In this study, we present the synthesis and the characterization of novel functionalized arylene main-chain ionomers based on perfluoro-p-xylene (PFX). The polymers were prepared by polycondensation of PFX and 4,4'-dihydroxybiphenyl or bisphenol 2,2-bis(4-hydroxyphenyl)-hexafluoropropane (bisphenol AF). After polymerization, the PFX unit was still able to undergo nucleophilic aromatic substitution reaction, which was used to introduce phosphonic acid groups into the polymer via a reaction with tris(trimethylsilyl)phosphite. Furthermore, electrophilic sulfonation of these polymers was possible in the bisphenol unit when using H2SO4/SO3 as the sulfonation agent. The so-obtained water-soluble PFX-based polyelectrolytes showed excellent chemical stability and were blended with polybenzimidazoles. The blend membranes formed flexible and mechanically robust films with excellent chemical and thermal stabilities.

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“…A condensation reaction between the -PO3H2 groups, which has been shown previously for phosphonated polymers [18], was confirmed in the case of 5 by the 31 P-NMR.…”

Section: Phosphonation Of Poly(arylene Ether Perfluoroxylene)supporting

confidence: 80%

“…The reason might be a condensation reaction between the two -PO3H2 groups during the hydrolysis reaction step [18,19].…”

Section: Phosphonation Of Poly(arylene Ether Perfluoroxylene)mentioning

confidence: 99%

Perfluoro-p-xylene as a New Unique Monomer for Highly Stable Arylene Main-Chain Ionomers Applicable to Low-T and High-T Fuel Cell Membranes

2015

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“…These investigations show high proton conductivity values (Figure 4), especially when compared to inorganic hydrates or some phosphonic acid containing polymers. [13] Even though the proton conductivity of p-6 PA-HPB is inferior to that observed for some sulfonated polysulfones, [14] p-6 PA-HPB presents certain advantages since its proton conductivity is temperatureindependent. Contrary to Nafion 117 [15] and the abovementioned polymers, this rather rigid system has an almost constant proton conductivity (3.…”

Section: Methodsmentioning

confidence: 99%

Phosphonated Hexaphenylbenzene: A Crystalline Proton Conductor

et al. 2009

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“…Further, within the coatings, interchain condensation [31] between two phosphonic acid groups forms phosphonic acid anhydrides, which accounts for the cross-link between the PVPA molecules in the coatings [28]. Unfortunately, phosphate anhydrides, whose stability is sensitive to water molecules [32,33], will be hydrolyzed in some water-based solvents. The anhydride hydrolysis reaction begins with the attack of a hydrogen or hydroxyl ion.…”

Section: Novel Ph-stable Frictional Behaviors and Mechanisms Of Pvpa-mentioning

confidence: 99%

Investigation of the mechanisms for stable superlubricity of poly(vinylphosphonic acid) (PVPA) coatings affected by lubricant

Zhang

Liu

et al. 2016

Friction

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Abstract:The stability of the tribological properties of polymer coatings is vital to ensure their long term use. The superlubricity of the poly(vinylphosphonic acid) (PVPA)-modified Ti6Al4V/polytetrafluoroethylene (PTFE) interface can be obtained when lubricated by phosphate-buffered saline (PBS, pH = 7.2), but not when lubricated by deionized water and ethanol. Therefore, the mechanisms for the superlubricity of PVPA coatings affected by lubricant were investigated in detail. The stability of the PVPA coatings and their compatibility with the lubricant are critical factors in realizing ideal tribological properties of PVPA coatings. Robust PVPA coatings are stable under a wide range of pH values (6-10) using PBS as the basic solution, and are also characterized by superlubricity. The hydrolysis kinetics of phosphate anhydride is the main reason for the pH responses. In addition, along with stability, PVPA coatings exhibit different friction coefficients in salt solutions which are composed of various ions, which indicates that the compatibility between PVPA coatings and the lubricant can be used to regulate the superlubricity properties. Based on a fundamental understanding of the mechanism of surperlubricity by considering the effects of the lubricant, PVPA coatings with stability and perfect tribological performance are expected to be applied in more aspects.

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Water sorption of poly(vinylphosphonic acid) and its influence on proton conductivity

Cited by 93 publications

References 19 publications

Perfluoro-p-xylene as a New Unique Monomer for Highly Stable Arylene Main-Chain Ionomers Applicable to Low-T and High-T Fuel Cell Membranes

Perfluoro-p-xylene as a New Unique Monomer for Highly Stable Arylene Main-Chain Ionomers Applicable to Low-T and High-T Fuel Cell Membranes

Phosphonated Hexaphenylbenzene: A Crystalline Proton Conductor

Investigation of the mechanisms for stable superlubricity of poly(vinylphosphonic acid) (PVPA) coatings affected by lubricant

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