Ionic aggregation characterization of sulfonated PEEK ionomers using by X-ray and DMA techniques

Song, Ju‐Myung; Shin, Junhwa; Sohn, Joon-Yong; Nho, Young Chang

doi:10.1007/s13233-012-0067-5

Cited by 28 publications

(29 citation statements)

References 33 publications

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“…The Bragg distance was calculated and is also listed in Table . The Bragg distance for the crosslinked membrane is in good agreement with the interionic spacing for the membrane previously reported by a number of authors . The similar Bragg distance of the unirradiated SPEEK membrane and irradiated SPEEK membrane indicates that the morphology of SPEEK was not significantly changed by the EB‐absorbed dose.…”

Section: Resultssupporting

confidence: 89%

“…It has various advantages such as excellent chemical stability, mechanical properties, and high proton conductivity. 8 However, the membrane also has many disadvantages, for example, high production costs, high methanol crossover, and decreased proton conductivity at temperatures above 80 C. 6,[9][10][11][12][13] Therefore, as an alternative to Nafion, many research groups have focused on aromatic hydrocarbon based ion-exchange membranes, such as sulfonated polyimide, 14 sulfonated polyphosphazene, 15,16 sulfonated poly(arylene ether), 17,18 and sulfonated poly(ether ether ketone), [19][20][21] which have high-temperature stability, low methanol permeability, environmental compatibility, and low cost. In particular, sulfonated poly(ether ether ketone) (SPEEK) has been considered a good candidate because it has excellent thermal, chemical, and mechanical properties and the proton conductivity can be easily controlled by the sulfonation conditions, such as the reaction time, temperature, and sulfonic acid con-tent.…”

Section: Introductionmentioning

confidence: 99%

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Polymer electrolyte membranes prepared by EB‐crosslinking of sulfonated poly(ether ether ketone) with 1,4‐butanediol

Song

Woo

Lee

et al. 2014

J of Applied Polymer Sci

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Crosslinked sulfonated poly(ether ether ketone) (SPEEK) membranes were prepared through the electron beam (EB)‐irradiation crosslinking of SPEEK/1,4‐butanediol under various irradiation conditions and used as a proton exchange membrane (PEM) for fuel cell applications. The crosslinked membranes were characterized by gel fraction, a universal testing machine (UTM), dynamic mechanical analysis (DMA), and small‐angle X‐ray scattering (SAXS). The gel fraction of the crosslinked membranes was used to estimate the degree of crosslinking, and the gel fraction was found to be increased with an increase of the crosslinker content and EB‐absorbed dose. The UTM results indicate that a brittle EB‐crosslinked membrane becomes more flexible with an increase in the crosslinker content. The DMA results show that the EB‐crosslinked membranes have well‐developed ionic aggregation regions and the cluster Tg of membranes decrease with an increase in the 1,4‐butanediol crosslinker content. The SAXS results show that the Bragg and persistence distance of crosslinked membranes increase with an increase in the crosslinker content. The proton conductivities of the EB‐crosslinked membranes were more than 9 × 10−2 S/cm. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41760.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Polymer electrolyte membranes prepared by EB‐crosslinking of sulfonated poly(ether ether ketone) with 1,4‐butanediol

Song

Woo

Lee

et al. 2014

J of Applied Polymer Sci

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“…Figure 3 shows the profiles obtained for the copolymer precursor and the sulfonated polymers F60 and S3, obtained under nitrogen and air atmospheres. As observed by Song et al, 43 the sulfonated polymers F60 and S3 start the decomposition process at lower temperature (ca 100 ∘ C) when compared with the copolymer precursor (ca 150 ∘ C), in both atmospheres (Fig. 3).…”

Section: Thermogravimetric Analysissupporting

confidence: 72%

New route to functional polyolefins: sulfonation of poly[ethylene‐co‐(5,7‐dimethylocta‐1,6‐diene)] and evaluation of properties

Vicente

Ferreira

Ribeiro

2017

Polymer International

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An ethylene/5,7‐dimethylocta‐1,6‐diene copolymer was sulfonated using two different approaches, solution and surface modification, varying parameters such as reaction time, temperature and concentration of the sulfonation reagent. Techniques such as attenuated total reflectance Fourier transform infrared spectroscopy, X‐ray photoelectron spectroscopy and elemental analysis confirmed the successful sulfonation of the copolymer by both methods. Water uptake studies showed that the polarity of the initial copolymer was markedly changed upon functionalization and that the sulfonation by the in‐solution method produced more hydrophilic polymers compared to the surface procedure. Moreover, differential scanning calorimetry and thermogravimetric analysis pointed out additional changes to the thermal properties of the sulfonated polymers relative to the copolymer precursor. This study showed that the sulfonation process of the non‐polar ethylene–diene copolymer led to a new hydrophilic material with a potential wide range of applications. © 2017 Society of Chemical Industry

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“…Este comportamento estaria de acordo com o surgimento de uma transição intermediária entre as T g s das fases sulfonadas e sem modificação. Resultado similar foi relatado recentemente por Song et al [17] em amostras com pequenas diferenças de teor de sulfonação de poli(éter-éter-cetona) (PEEK).…”

Section: Gomes a C O Et Al -Membranas Híbridas Com Potencial Usounclassified

Membranas Híbridas com Potencial Uso em Células a Combustível - Parte 2: Nanocompósitos de Poli(Carbonato) Sulfonado

Gomes¹,

Machado²,

Filho³

et al. 2014

Polímeros

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Resumo: Membranas poliméricas condutoras de íons têm sido cada vez mais estudadas para o uso em células a combustível. Entretanto, as membranas poliméricas disponíveis no mercado para este fim apresentam algumas limitações de condições de trabalho. Neste estudo o poli(carbonato) modificado quimicamente para uso como membrana condutora de íons foi caracterizado e teve seu desempenho avaliado. A formação de um nanocompósito baseado em sepiolita visou ao aumento na resistência mecânica e térmica das membranas, propriedades, a princípio, prejudicadas pela sulfonação do material. As membranas foram avaliadas por FTIR, DSC, TGA, DMA, inchamento em água, transmissão de vapor de água e resistência à migração iônica. Os resultados mostraram ser possível atingir um balanço estrutura versus propriedades visando a um elevado desempenho das membranas. Palavras-chave: Membrana polimérica, nanocompósito polimérico, célula a combustível, eletrólito polimérico. Hybrid Membranes of Polymer/Clay for Fuel Cell Applications. Part 2. Sulphonated Poly(Carbonate) NanocompositesAbstract: Ion-conducting polymeric membranes have been studied for use in fuel cells. However, polymeric membranes available in the market show some disadvantages. Here we modified polycarbonate chemically for use as ion-conducting membranes, and investigated its performance. The use of the nanoclay sepiolite aimed at improving the mechanical and thermal resistance, which are negatively affected by polymer sulphonation. The membranes were evaluated using FTIR, DSC, TGA, DMA, water swelling, water vapor uptake and ionic migration resistance. The results indicated it to be possible to reach a tradeoff between structure and properties for obtaining high-performance membranes.

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Ionic aggregation characterization of sulfonated PEEK ionomers using by X-ray and DMA techniques

Cited by 28 publications

References 33 publications

Polymer electrolyte membranes prepared by EB‐crosslinking of sulfonated poly(ether ether ketone) with 1,4‐butanediol

Polymer electrolyte membranes prepared by EB‐crosslinking of sulfonated poly(ether ether ketone) with 1,4‐butanediol

New route to functional polyolefins: sulfonation of poly[ethylene‐co‐(5,7‐dimethylocta‐1,6‐diene)] and evaluation of properties

Membranas Híbridas com Potencial Uso em Células a Combustível - Parte 2: Nanocompósitos de Poli(Carbonato) Sulfonado

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