Development of Hydrogel Polyelectrolyte Membranes with Fixed Sulpho-Groups via Radical Copolymerization of Acrylic Monomers

Abstract

Electrolyte hydrogels are perspective materials for applications in electrochemical devices, which work at ambient temperatures. In this work, hydrogel sulpho-modified membranes were formed by radical co-polymerization of sodium styrensulphonate and potassium sulphopropyl acrylate with acrylamide and acrylonitrile. The hydrogel membranes were obtained in the form of thin films. Properties of the membranes were studied by thermogravimetry, mass-spectrometry and IR-spectrometry. The prepared membranes were thermally stable up to 70°C - 90°C, and showed ion exchange capacity and swelling coefficients sufficient for use as ion-exchange or proton-conducting membranes

Synthesis and Characterization of Organic-Inorganic Membranes Containing Sulphogroups

“…However, it must be mentioned, that an increase of polar group number in the membrane structure leads to its higher swelling, which significantly decreases its mechanical strength. The experimental value of ion-exchange capacity of the copolymer (sulphogroup-containing monomer potassium sulphopropyl acrylate -content in initial polymerizing mixture was 10 wt %) was 0.4 mg-equiv/g, which is consistent with the data of [8]. For organicinorganic copolymer with 20 wt % SGS in the initial mixture the experimental value of ion-exchange capacity was slightly lower -0.38 mg-equiv/g.…”

“…These temperatures are higher compared to temperatures usually used in fuel cells (363-393 K). Ionexchange capacity of copolymer sulphocontaining membrane has been found to be 0.4 mg-equiv/g аnd of organic-inorganic one -0.38 mg-equiv/g, that is consistent with the results in [8]. However, both types of membranes have too high degree of water uptake, which leads to the superfluous swelling and loss of mechanical strength.…”

“…Sulphogroups -SO 3 Heasily dissociate in water forming proton H + , that provides ion-exchanging and conductive properties of material. In [8] the hydrogel polyelectrolyte membrane was synthetized via radical copolymerization of sulphopropyl acrylate potassium salt and sodium styrene sulphonate with acrylamide and acrylonitrile in aqueous media. The process of gel formation was induced by potassium persulphate-sodium metabisulphite oxidation-reduction system.…”

The Influence of the Hydrophobic Component Content on the Properties of Hybrid Polymer-Inorganic Membranes

“…1a). The broad bands at around 3400-3100 cm -1 are observed due to amino groups without hydrogen bonds and with hydrogen bonds [14,15]. The characteristic band at 2243 cm -1 is ascribed to the stretching vibration of C≡N groups.…”

Proton-conducting Organic-inorganic Sulfo-containing Membranes for Fuel Cell

“…The broad absorption band with peaks at 1634 and 1731 cm −1 is attributed to the vibrational stretching of intermolecular hydrogen bonds between carbonyl groups and free stretching vibrations of the carbonyl group, respectively [13]. In all spectra there is a peak at 1124 cm -1 , which is attributed to C-O-C stretching and inherent in the spectrum poly(EGDA).The asymmetric vibrations ν(SO) of the sulfonic acid group contained in SPAK are observed as the bands at 1040 and 1168 cm -1 [14].…”