Sulfoethylation of polysaccharides—A comparative study

Gabriel, Lars; Koschella, Andreas; Tied, Antje; Pfeifer, Annett; Heinze, Thomas

doi:10.1016/j.carbpol.2020.116533

Cited by 5 publications

(6 citation statements)

References 39 publications

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“…The polymer was subsequently extracted by filtration, cleaned, and dried. A sample with a sulfo ethyl group substitution level of 0.7 was obtained 16 …”

Section: Methodsmentioning

confidence: 99%

“…Frequency response analysis (FRA) and electrochemical impedance spectroscopy (EIS) were employed to evaluate the proton conductivity of the composite membranes. A 5 mV oscillation potential was applied, ranging from 100 kHz to 10 Hz 16 . The EIS measurement for each membrane and at any temperature was repeated three times.…”

Section: Methodsmentioning

confidence: 99%

“…The SEC was synthesized using a procedure that was described previously. 16 In summary, cellulose was dissolved in 2-propanol under a nitrogen atmosphere, after which sodium hydroxide and sodium vinyl sulfonate were introduced. After stirring the mixture for 3 h at 85 C, the resulting solution was neutralized.…”

Section: Sulfo Ethyl Cellulose Synthesismentioning

confidence: 99%

“…A 5 mV oscillation potential was applied, ranging from 100 kHz to 10 Hz. 16 The EIS measurement for each membrane and at any temperature was repeated three times. The error margin for the measurements is error ±0.5.…”

Section: Proton Conductivitymentioning

confidence: 99%

“…Similar findings were reported for the sulfonated poly (ether ether ketone)/SEC composite sample. 16 Enhancement can be elucidated by the increased abundance of sulfonic groups and greater surface area of the composites, facilitating higher water adsorption compared to Nafion membranes. 23 Because of its small particles size (Figure 3), SEC/Nafion-10 exhibits no difference in adsorption or desorption, and the rate at which water attaches to the composite surface is almost equivalent to the rate at which it releases.…”

Section: Dynamic Vapor Sorptionmentioning

confidence: 99%

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Sulfo ethyl cellulose/Nafion composite for high‐temperature proton exchange membrane

Charradi,

Landolsi,

Heinze

et al. 2024

J of Applied Polymer Sci

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This study investigated the potential enhancement of proton conductivity in Nafion membranes through the incorporation of sulfo ethyl cellulose (SEC) at varying weight ratios (5 and 10 wt.%). Results indicated that increasing the weight ratio of SEC led to improvements in water absorption, activation energy, and proton conductivity within the composite membranes. Specifically, the composite membrane exhibited a significant increase in proton conductivity, reaching up to 170 mS cm−1, in contrast to the pristine Nafion membrane which recorded 40.08 mS cm−1, particularly at temperatures exceeding 120°C. At the sub‐molecular level, Fourier transfer inferred spectroscopy (FTIR) analysis of Nafion/SEC membranes unveiled cross‐linking interactions occurring between the sulfo acid groups of Nafion chains and the hydroxyls within the SEC matrix. Moreover, X‐ray diffraction (XRD) findings of the composite membranes were instrumental in identifying crystalline phases, orientation, and structural features. The results indicated variations in atomic radius and alterations in lattice parameters at the nanoscale, induced by heightened surface forces resulting from the inclusion of SEC in the Nafion matrix. This phenomenon leads to a reduction in crystallite size, accompanied by an increase in peak broadening and surface area within the composite membranes. Such changes signify a clear interaction between SEC and Nafion, as confirmed by both scanning electron microscopy and thermal gravimetry analyses. Taken together, these findings strongly indicate that the cross‐linked composite membranes utilizing SEC‐Nafion hold significant promise as proton exchange membranes.

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“…The polymer was subsequently extracted by filtration, cleaned, and dried. A sample with a sulfo ethyl group substitution level of 0.7 was obtained 16 …”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Sulfo Ethyl Cellulose Synthesismentioning

confidence: 99%

Section: Proton Conductivitymentioning

confidence: 99%

Section: Dynamic Vapor Sorptionmentioning

confidence: 99%

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