Partially Sulfonated Polystyrene and Poly(2,6‐dimethyl‐1,4‐phenylene oxide) Blend Membranes for Fuel Cells

Jung, Bumsuk

doi:10.1002/marc.200400119

Cited by 27 publications

(17 citation statements)

References 30 publications

(13 reference statements)

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“…This effect became more pronounced with the increase in the SA concentration. This can be explained by the fact that the randomness of the amorphous phase in the membranes is increased by either the increase of sulfonic acid groups or the crosslinking degree, which gives rise to a perturbation of long-ranged spacing between the chains [25].…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterization of crosslinked cellulose/sulfosuccinic acid membranes as proton conducting electrolytes

Seo

Kim

Koh

et al. 2009

Ionics

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A series of crosslinked polymer electrolyte membranes were prepared by blending cellulose and sulfosuccinic acid (SA) for fuel cell applications. The crosslinking reaction of membranes occurred via the esterification between -OH of cellulose and -COOH of SA, as confirmed by FT-IR spectroscopy. Both the ion exchange capacity and the proton conductivity increased in proportion to the increase of SA concentrations due to the increasing portion of charged groups in the membrane. In contrast, the water uptake linearly increased up to 25 wt.% of SA concentration, above which it decreased abruptly. The maximum behavior of water uptake may be a result of competitive effect between the increasing number of ionic sites and the increasing degree of crosslinking with the SA concentrations. Wide angle X-ray scattering also showed that the crystalline structures of cellulose disappeared upon the introduction of SA. The mechanical properties of cellulose/SA membranes, i.e., tensile strength at break and Young's modulus, showed a maximum at 15 wt.% of SA, as revealed by universal testing machine. These membranes exhibited good thermal stability up to 250°C, as revealed by thermal gravimetric analysis.

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Section: Resultsmentioning

confidence: 99%

Preparation and characterization of crosslinked cellulose/sulfosuccinic acid membranes as proton conducting electrolytes

Seo

Kim

Koh

et al. 2009

Ionics

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“…One attractive class of alternatives for Nafion ® is sulfonated high performance condensation polymers, including poly(arylene ether ketones) [2][3][4][5], poly(arylene ether) [6,7], poly(arylene ether sulfones) [8][9][10], and polyimides [11][12][13][14]. These polymers were prepared from both direct polymerization of sulfonated monomers and post-sulfonation on polymer chains.…”

Section: Introductionmentioning

confidence: 99%

Using silica nanoparticles for modifying sulfonated poly(phthalazinone ether ketone) membrane for direct methanol fuel cell: A significant improvement on cell performance

Liu

Sun

et al. 2006

Journal of Power Sources

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“…It may be explained by the fact that the randomness of the amorphous phase in graft copolymer is enhanced by introducing grafting side chains, which gives rise to a perturbation of longranged spacing between the chains. 43 Upon the introduction of TEOS and hydrolysis in an acidic condition (Figure 4(c)), the relative intensity of crystalline peak at 20.0 o was further decreased, indicating more structureless amorphous morphology of nanocomposite membranes.…”

Section: Resultsmentioning

confidence: 94%

Nanocomposite proton conducting membranes based on amphiphilic PVDF graft copolymer

et al. 2010

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A novel comb-like amphiphilic graft copolymer of poly(vinylidene fluoride-co-chlorotrifluoroethylene)-graft-poly(4-styrene sulfonic acid-co-trimethoxysilyl propyl methacrylate), i.e. P(VDF-co-CTFE)-g-P(SSA-co-TMSPMA) was synthesized using an atom transfer radical polymerization (ATRP) technique. Successful synthesis and a microphase-separated structure of the copolymer were confirmed by proton nuclear magnetic resonance ( 1 H NMR), FTIR spectroscopy and transmission electron microscopy (TEM). This graft copolymer was combined with tetraethoxysilane (TEOS) under acidic conditions to produce organic-inorganic nanocomposite membranes through an in-situ sol-gel reaction between TEOS and PTMSPMA, as characterized by X-ray diffraction (XRD) and TEM. Upon the introduction of silica, the proton conductivity and water uptake of the membranes decreased slightly but the thermal and mechanical properties of the membranes were enhanced significantly. Various morphologies of the nanocomposite membranes were obtained after controlling the TEOS concentration, which were correlated with the thermal, mechanical and transport properties.

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Partially Sulfonated Polystyrene and Poly(2,6‐dimethyl‐1,4‐phenylene oxide) Blend Membranes for Fuel Cells

Cited by 27 publications

References 30 publications

Preparation and characterization of crosslinked cellulose/sulfosuccinic acid membranes as proton conducting electrolytes

Preparation and characterization of crosslinked cellulose/sulfosuccinic acid membranes as proton conducting electrolytes

Using silica nanoparticles for modifying sulfonated poly(phthalazinone ether ketone) membrane for direct methanol fuel cell: A significant improvement on cell performance

Nanocomposite proton conducting membranes based on amphiphilic PVDF graft copolymer

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