Synthesis and characterization of new sulfonated poly(arylene ether 1,3,4-oxadiazole)s

Vetter, S.; Nunes, Suzana Pereira

doi:10.1016/j.reactfunctpolym.2004.05.002

Cited by 22 publications

(10 citation statements)

References 27 publications

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“…[102] New sulfonated polyoxadiazoles have been prepared. [103] The synthesis of sulfonated oxazole telechelics has been reported as an intermediate route for the preparation of block copolymers with stable backbones for proton conductive membranes. [96] Other copolymers based on polyketones are currently under development.…”

Section: Reviewsmentioning

confidence: 99%

Developments in Membrane Research: from Material via Process Design to Industrial Application

et al. 2006

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The aim of this review paper is to give an overview of the research activities of GKSS in the field of polymer based membranes. After summarizing the historic development of membrane science at GKSS, it describes different classes of polymeric materials for membranes, and the characterization of membranes. The design of membrane‐based separation processes followed by examples of applications will also be presented. In the last chapter we will try to give an outlook for the future activities in membrane research.

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Section: Reviewsmentioning

confidence: 99%

Developments in Membrane Research: from Material via Process Design to Industrial Application

et al. 2006

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“…In this context, a lot of work has been done in order to synthesize polymers and copolymers bearing sulfonic and/or phosphonic groups due to their good proton-conductivity [1][2][3][4][5][6][7][8][9][10][11][12]. When methanol is used as fuel, the desired properties such as low methanol cross-over, high protonconductivity can just be achieved through the preparation of organic-inorganic hybrid material or nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Analysis of proton-conducting organic–inorganic hybrid materials based on sulphonated poly(ether ether ketone) and phosphotungstic acid via ASAXS and WAXS

Prado

Ponce

Goerigk

et al. 2009

Journal of Non-Crystalline Solids

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a b s t r a c tIn the present paper the distribution of phosphotungstic acid (PTA, H 3 PW 12 O 40 ) dispersed in sulfonated poly(ether ether ketone), SPEEK, was investigated by Anomalous Small Angle X-ray scattering (ASAXS) and Wide-Angle X-Ray Scattering WAXS techniques. The hydrolysis and condensation of 3-aminopropyltrimethoxysilane or zirconium tetrapropylate in this polymeric matrix were used to produce poly(3-aminopropyl silsesquioxane) or ZrO 2 , as nanofillers. Contrary to previous results reported for membranes containing phosphomolybdic acid, the PTA could be completely dissolved in the SPEEK matrix. The applicability of the Guinier approximation for the SPEEK/PTA membrane confirmed that the PTA was dispersed as isolated nanoparticles. The incorporation of poly(3-aminopropyl silsesquioxane) in the SPEEK/PTA system caused the agglomeration of the heteropolyacid as 30 nm large particles. The ZrO 2 had little effect on the distribution of PTA in the SPEEK matrix. On the other hand, no crystallization of the heteropolyacid was observed in the membranes.

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“…[11][12][13] Oxadiazole-based materials have already been studied in our group and recently we reported that during the polyoxadiazole polymerization, sulfonation reaction takes place leading to the formation of a partially sulfonated polymer with high molecular weight (about 400 000 g Á mol À1 ) and with good thermal stability enabling the casting of flexible dense membranes. [13][14][15] Sulfonated polyoxadiazole possesses in its structure both donor and acceptor hydrogen. This enables the polymer to transport protons both by the dissociation from their anionic counterion and also by the acid adduct after protonation with H 2 SO 4 .…”

Section: Full Papermentioning

confidence: 99%

Protonation of Sulfonated Poly(4,4′‐diphenylether‐1,3,4‐oxadiazole) Membranes

Roeder

Gomes

Ponce

et al. 2007

Macro Chemistry & Physics

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This work describes the effect of sulfuric acid protonation on the properties of SPOD‐DPE membranes using FT‐IR and impedance spectroscopic analyses. The IR spectra showed the protonation of nitrogen atoms from oxadiazole rings, with a broad band complex in the region 3 000–2 100 cm−1 with two centered peaks at 2 590 and 2 440 cm−1. The SO characteristic absorption bands in SPOD‐DPE and sulfuric acid were specially studied in the region of 1 800–900 cm−1. The band shifts are associated to the interaction between acid groups and oxadiazole ring nitrogen atoms. The IR spectra evidenced the presence of three absorption species (HSO, SO and free H2SO4) depending on the sulfuric acid concentration. For the protonated SPOD‐DPE membranes, a proton conductivity around 10 mS · cm−1 was reached at 50 °C.magnified image

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Synthesis and characterization of new sulfonated poly(arylene ether 1,3,4-oxadiazole)s

Cited by 22 publications

References 27 publications

Developments in Membrane Research: from Material via Process Design to Industrial Application

Developments in Membrane Research: from Material via Process Design to Industrial Application

Analysis of proton-conducting organic–inorganic hybrid materials based on sulphonated poly(ether ether ketone) and phosphotungstic acid via ASAXS and WAXS

Protonation of Sulfonated Poly(4,4′‐diphenylether‐1,3,4‐oxadiazole) Membranes

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