Conductivity and methanol permeability of sulfonated polystyrene membrane with dispersed montmorillonite nanoclay

Chen, Yu-Nung; Chung, Pei-Yuan; Yen, Shi‐Chern

doi:10.1002/pc.22324

Cited by 6 publications

(5 citation statements)

References 27 publications

(30 reference statements)

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“…Unfortunately, these materials are expensive and show very high methanol permeability, making them unsuitable for direct methanol fuel cells (DMFCs). Therefore, the development of alternative PEMs for Nafion has attracted extensive interests in both academic and industrial field over the past few years.…”

Section: Introductionmentioning

confidence: 99%

Effect of clay modification on the structure and properties of sulfonated poly(ether ether ketone)/clay nanocomposites

Jia

Lin

et al. 2015

Polym. Compos.

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Sulfonated poly(ether ether ketone) (SPEEK)/clay hybrid membranes were prepared using three types of commercially available clays, the sodium montmorillonite (IC), hydrophobic organo‐clay with long alkyl chains (OC), and organo‐clay with carboxylic acid end groups (HC). It was found that the SPEEK/HC hybrid membranes achieved the best clay dispersion, with the exfoliation of the clay nano‐platelets when the filler loading was < 10 wt%. The incorporation of the carboxylic acid groups in clay layers also improved the connectivity between the ionic clusters in the membrane, resulting in higher proton conductivity without compromising the dimensional stability of membranes. The selectivity higher than the pristine SPEEK membranes was obtained for the SPEEK/HC hybrid membranes at low filler loading (<10 wt%), with higher proton conductivity and similar methanol permeability. POLYM. COMPOS., 37:2632–2638, 2016. © 2015 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Effect of clay modification on the structure and properties of sulfonated poly(ether ether ketone)/clay nanocomposites

Jia

Lin

et al. 2015

Polym. Compos.

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“…71 Moreover, the presence of the HNTs in the nanochannels will block the methanol transport pathway and increase the methanol transport distance, thus lowering the methanol crossover by about 275% at 25 C compared to SPS. 76 The ideal PEM for a DMFC ought to have high proton conductivity and reduced methanol permeability. Since proton conductivity and methanol permeability exhibit identical molecular transport mechanisms, the selectivity parameter, defined as the ratio of proton conductivity to methanol permeability, is a reliable performance indicator for PEMs.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, Im moieties interfere with methanol permeation while facilitating proton transfer through formed interactions with sulfonic acid groups 71 . Moreover, the presence of the HNTs in the nanochannels will block the methanol transport pathway and increase the methanol transport distance, thus lowering the methanol crossover by about 275% at 25°C compared to SPS 76 …”

Section: Resultsmentioning

confidence: 99%

Nanocomposite proton conducting membranes based on sulfonated polystyrene/imidazole‐2‐acetic acid blend for direct methanol fuel cell application

Arab,

Tohidian,

Shamsabadi

2023

J of Applied Polymer Sci

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Nanocomposite polyelectrolyte membranes based on sulfonated polystyrene (SPS) /imidazole‐2‐acetic acid (Im) blend (SPSIm), incorporated with halloysite nanotubes (HNTs) were studied for direct methanol fuel cell (DMFC) applications. Firstly, PS was sulfonated at various degrees of sulfonation (DS), and the optimum DS was selected based on hydrolytic stability. Then, SPS was blended with Im as new proton conducting sites. In addition to increasing proton conductivity, methanol permeability decreased due to the attractive interaction between Im and SO3H groups in SPS. In the next step, to introduce tortuous diffusion pathways and hence decrease the methanol crossover, halloysite nanotubes were incorporated into the SPSIm matrix. The results show that the methanol permeability of the membrane incorporated with 1 wt% HNT (SPSIm/HNT) was around 0.527 × 10−7 cm2 s−1, which showed a significant decrease compared to SPS, causing an improvement in the membrane selectivity parameter in comparison to pristine SPS membrane. Furthermore, the thermal properties, ion exchange capacity (IEC), water uptake behavior, and performance of the membranes were evaluated. Based on the results, owing to the reduced methanol permeability, acceptable power density, ease of preparation, as well as low cost, SPSIm/HNT could be considered for DMFC applications.

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“…Recently, polymer-clay nanocomposites have attracted considerable interest from researchers due to their tremendous properties and broad applications [1][2][3][4][5]. By introducing a low clay content (usually 1-10 wt %) into a polymer matrix, these nanocomposites can achieve many unique properties, such as reduced thermal diffusion coefficients, increased barrier characteristics, high heat-distortion temperatures, decreased gas permeability and enhanced mechanical properties, compared with conventional composites or pure polymers [6][7][8][9]. The factors impacting the efficiency of these nanocomposite materials include the aspect ratio of the clay layers, the dispersion quality and the interfacial adhesion between the polymer matrix and the clay layers [10,11].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Polystyrene-Montmorillonite Nanocomposite Particles Using an Anionic-Surfactant-Modified Clay and Their Friction Performance

Yue

Deng

et al. 2018

Applied Sciences

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Polystyrene-organo-montmorillonite (PS-OMMT) nanocomposite particles were prepared via emulsion polymerization of styrene in the presence of montmorillonite modified with an anionic surfactant, sodium lauryl sulfonate (SLS), and its tribological properties as an additive to polyalphaolefin (PAO) were tested. The results of Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA) showed that SLS molecules resided in the montmorillonite (MMT) interlayer space. The effects of OMMT on the morphology and properties of the nanocomposites were also investigated. Gel permeation chromatography (GPC) and dynamic light scattering (DLS) demonstrate that the presence of OMMT can effectively reduce the average molecular weight and average particle size of PS. XRD and transmission electron microscopy (TEM) of the PS-OMMT nanocomposites indicate that exfoliated and intercalated structures form and that the MMT layers either are partly embedded inside the PS particles or remain on their surface. Compared with pure PS, the PS-OMMT nanocomposites possessed higher stability to thermal decomposition and higher glass transition temperatures. Adding nanocomposite particles reduces the friction coefficient, and thus, the antiwear properties of the PAO are significantly improved. The PS-OMMT-3 (3 wt % of OMMT based on styrene) particles have the best tribological performance and maintained a stable, very low coefficient of friction of 0.09.

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Conductivity and methanol permeability of sulfonated polystyrene membrane with dispersed montmorillonite nanoclay

Cited by 6 publications

References 27 publications

Effect of clay modification on the structure and properties of sulfonated poly(ether ether ketone)/clay nanocomposites

Effect of clay modification on the structure and properties of sulfonated poly(ether ether ketone)/clay nanocomposites

Nanocomposite proton conducting membranes based on sulfonated polystyrene/imidazole‐2‐acetic acid blend for direct methanol fuel cell application

Synthesis and Characterization of Polystyrene-Montmorillonite Nanocomposite Particles Using an Anionic-Surfactant-Modified Clay and Their Friction Performance

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