On the molecular weight determination of a poly(aryl-ether-ether-ketone) (PEEK)

Devaux, Jacques; Delimoy, D; Daoust, Daniel; Legras, Roger; Mercier, Jean‐Pierre; Strazielle, C.; Nield, E.

doi:10.1016/0032-3861(85)90179-x

Cited by 146 publications

(72 citation statements)

References 10 publications

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“…A new absorption band at 1080 cm −1 in SPEEK was assigned to sulfur-oxygen symmetric vibration O=S=O. The new absorptions at 1255, 1080, and 1020 cm −1 which appeared upon sulfonation were assigned to the sulfonic acid group in SPEEK [31], as their intensities with respect to the backbone carbonyl band at 1651 cm −1 increased with DS. There is no change in the carbonyl band at 1651 cm −1 for SPEEK compared with PEEK.…”

Section: Ftir Studymentioning

confidence: 99%

“…The DS as a function of reaction time has been studied previously by different methods [8,17,[29][30][31][32][33][34][35]. In the present study, the DS values acquired for Victrex ® PEEK (V-PEEK) at ambient temperature directly in sulfuric acid solution, after deducting a variation of 0.15, are plotted versus sulfonation reaction time (Fig.…”

Section: Sulfonation and Nmr Studymentioning

confidence: 99%

“…Table 1 shows the comparison of the DS of both Victrex ® and Gatone ® PEEK sulfonated at room temperature. Several studies on the sulfonation reaction kinetics and characterization of SPEEK were reported [7,8,[14][15][16][17][29][30][31][32][33][34][35]. Jin et al [15] investigated the sulfonation of PEEK using concentrated sulfuric acid at room temperature and reported that sulfonation is limited to DS 1.0 and occurs only on the four chemically equivalent positions of hydroquinone segment [29] (Fig.…”

Section: Sulfonation and Nmr Studymentioning

confidence: 99%

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Synthesis and characterization of sulfonated poly(ether ether ketone) for proton exchange membranes

Xing

Robertson

Guiver

et al. 2004

Journal of Membrane Science

926

313

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Synthesis and characterization of sulfonated poly(ether ether ketone) for proton exchange membranes Xing, P.; Robertson, Gilles; Guiver, Michael; Mikhailenko, S.; Wang, K.; Kaliaguine, S. AbstractSeries of sulfonated poly(ether ether ketone)s (SPEEKs) were prepared by sulfonation of commercial Victrex ® and Gatone ® PEEK for a comparative study of proton exchange membranes (PEM) intended for fuel cell applications. The degree of sulfonation (DS) of the sulfonated PEEK was determined from deuterated dimethyl sulfoxide (DMSO-d 6 ) solution of the purified polymers using 1 H NMR methods. The second method using a solvent suppression technique, in which DS results were obtained directly from 1 H NMR spectra of SPEEK dissolved in sulfuric acid (non-deuterated) reaction medium was evaluated. The variation between the two methods was determined. The room temperature sulfonation of PEEK, monitored directly by second 1 H NMR method, proceeded rapidly initially, reaching DS ∼ 0.8 within 1 week, but progressed slowly thereafter. A maximum DS of 1.0 was determined after 1 month at ambient temperature (∼22• C). The thermal properties of SPEEK were characterized by means of DSC and TGA. The mass averaged molecular weights M w of both Victrex ® and Gatone ® PEEK were estimated from intrinsic viscosities measured in sulfuric acid solutions. It was verified that higher temperature (55• C) did not induce any apparent chain degradation of Victrex ® (or Gatone ® ) PEEK by M w tests. The water uptake and swelling properties of prepared films were studied and the proton conductivities at different temperatures were measured. The conductivities of the SPEEKs were found to increase with increasing DS and temperatures. The effect of film casting solvents on the conductivities is also discussed.

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Section: Ftir Studymentioning

confidence: 99%

Section: Sulfonation and Nmr Studymentioning

confidence: 99%

Section: Sulfonation and Nmr Studymentioning

confidence: 99%

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Synthesis and characterization of sulfonated poly(ether ether ketone) for proton exchange membranes

Xing

Robertson

Guiver

et al. 2004

Journal of Membrane Science

926

313

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“…An absorption band at 1080 cm −1 in SPEEK 58 was assigned to sulfur-oxygen symmetric vibration O=S=O. The absorptions at 1219, 1076, and 1020 cm −1 were assigned to the sulfonic acid group in SPEEK 58 [37] . The absorption at 709 cm -1 was attributed to S-O stretch vibration.…”

Section: Resultsmentioning

confidence: 99%

Nanostructured Polyelectrolytes Based on SPEEK/TiO2 for Direct Ethanol Fuel Cells (DEFCs)

Filho¹,

Santos²,

Gomes³

2014

Polímeros

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Proton-conducting hybrid membranes consisting of poly(ether ether ketone) sulfonated (SPEEK) and titanium oxide (TiO 2 ) were prepared using the sol-gel technique for application in direct ethanol fuel cells. The effect from TiO 2 incorporation on membrane properties such as ethanol uptake, pervaporation and proton conductivity was investigated. The uptake and permeated flux decreased with increasing content of TiO 2 . The ethanol permeability was about one order of magnitude smaller than Nafion  117. FTIR spectra indicated that PEEK was sulfonated and the second degradation temperature of SPEEK58 samples confirmed the titanium oxide incorporation. The proton conductivity in ethanol solution was of the order of 10 -3 S cm -1 when 4 or 8 wt% TiO 2 were added, and generally increased with addition of TiO 2 .

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“…As we know, the synthesis of PAEKs needs high reaction temperature (160-200°C) and polar solvents such as DMAc, NMP and DMSO [16]. Need for usage of high boiling solvents makes it a highly energy reaction.…”

Section: Resultsmentioning

confidence: 99%

Ionic liquids as green reaction media for synthesis of poly(aryl ether ketone)s

Wang

Liu

2013

Chin. Sci. Bull.

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Poly(aryl ether ketone)s (PAEKs) were successfully synthesized via nucleophilic aromatic substitution (S N AR) mechanism, using ionic liquids as green reaction media. The influence of various reaction parameters including monomer concentration, dehydration time, polymerization temperature and duration, IL's cations and anions nature, upon PAEKs molecular weight was investigated. In addition, the peculiarities of hydrogen-bonding ability of ILs were investigated. The interaction of 2,2-bis(4-hydroxyphenyl) propane (bisphenol A) with ILs has a strong influence on PAEKs synthesis. Various moderate molecular weight PAEKs have been obtained in high yields with molecular weights ranging from 10000 to 18000 g mol 1 .high performance polymers, ionic liquids, poly(aryl ether ketone)s, polycondensation Citation:Wang J, Liu Z P. Ionic liquids as green reaction media for synthesis of poly(aryl ether ketone)s.

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On the molecular weight determination of a poly(aryl-ether-ether-ketone) (PEEK)

Cited by 146 publications

References 10 publications

Synthesis and characterization of sulfonated poly(ether ether ketone) for proton exchange membranes

Synthesis and characterization of sulfonated poly(ether ether ketone) for proton exchange membranes

Nanostructured Polyelectrolytes Based on SPEEK/TiO2 for Direct Ethanol Fuel Cells (DEFCs)

Ionic liquids as green reaction media for synthesis of poly(aryl ether ketone)s

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