Showing papers on "Nafion published in 1979"
TL;DR: In this article, the spectrum of Nafion cation exchange membranes was made possible by use of i.r. absorption and reflectance (ATR) spectroscopy.
126 citations
TL;DR: The diffusion coefficient of bromine through Nafion® perfluorinated ion exchange membranes has been determined as a function of the equivalent weight of the membrane, the membrane pretreatment, and the solute concentration as mentioned in this paper.
Abstract: The diffusion coefficient of bromine through Nafion® perfluorinated ion exchange membranes has been determined as a function of the equivalent weight of the membrane, the membrane pretreatment, and the solute concentration. The measured voltage decay of bromine concentration cells is interpreted in terms of a simple mathematical model that takes into account the solution equilibrium between bromine, bromide, and tribromide ions followed by diffusion of bromine or tribromide ions through the membrane. Diffusion coefficients fall in the range of corresponding to bromine fluxes from or current densities from 0.3 to 10 mA/cm2. Bromine fluxes as a function of solute concentration are determined directly by quantitative cathodic reduction of bromine or tribromide after diffusion through the membrane.
66 citations
TL;DR: In this article, a Nafion ® cation permselective membrane was used in anhydrous hydrogen fluorinde (AHF) in a series of electrofluorinations of organic compounds.
22 citations
TL;DR: In this article, the reactivity of the catalysts and molecular-weight distribution of the products were compared in the cationic oligomerization of styrene by a solid superacid (Perfluorinated Resinsulfonic Acid: Nafion-H) and by the corresponding soluble super acid (CF3SO3H).
Abstract: In the cationic oligomerization of styrene by a solid superacid (Perfluorinated Resinsulfonic Acid: Nafion-H) and by the corresponding soluble superacid (CF3SO3H), the reactivity of the catalysts and molecular-weight distribution of the products were compared. Oligomers composed of dimer to hexamer were produced with Nafion-H, whereas a linear dimer was mainly obtained with CF3SO3H in nonpolar solvents at 50—70°C. As a superacid solid catalyst, Nafion-H had the following characteristics: (1) retention of the catalytic activity on repeated reaction and the absence of a limiting yield; (2) higher activity than that of a conventional poly(styrenesulfonic acid) resin; (3) virtual absence of solvent effects on the reaction rate and the product composition; and (4) formation of Friedel–Crafts adducts between styrene and an aromatic solvent.
13 citations
11 citations
1 citations
10 Dec 1979
TL;DR: In this paper, the infrared and far-infrared spectra of Nafion polymers were analyzed and the effect of dehydration of the ionomers on cation-motion vibrations, cationsite bonding, and the nature of hydrogen bonding in the hydrated ionomers was investigated.
Abstract: : The infrared and far-infrared spectra of alkali, alkaline earth and transition metal ionomers of perfluorocarbonsulfonic acid (Nafion) polymers are reported. The cation motion features have been observed and the strength of the cation-site interactions determined. The effect of dehydration of the ionomers on cation-motion vibrations, cation-site bonding, and the nature of hydrogen bonding in the hydrated ionomers has been investigated. (Author)
1 citations