Results 111 to 120 of about 851 (169)

Sulfonated poly(ether ether ketone) and sulfonated poly(1,4-phenylene ether ether sulfone) membranes for vanadium redox flow batteries

High Performance Polymers, 2012
Nafion is a currently used as a proton exchange membrane in vanadium redox flow batteries (VRBs). It is an excellent proton-conducting and fully hydrated membrane, but it is costly. In order to reduce the cost of the membrane used in VRBs and to reduce vanadium permeability across the membrane, sulfonated poly(ether ether ketone ...
Anuvat Sirivat, Kitipat Siemanond
exaly   +2 more sources

Preparation and characterization of monovalent cation selective sulfonated poly(ether ether ketone) and poly(ether sulfone) composite membranes

Journal of Colloid and Interface Science, 2006
Highly charged cation permeable composite membranes were prepared by blending of sulfonated poly(ether sulfone) (SPES) with sulfonated poly(ether ether ketone) (SPEEK) in 0 to 90% weight ratio, to adjust the hydrophobic properties and ion selective nature. Extent of sulfonation was confirmed by 1H NMR and ion exchange capacity and degree of sulfonation
Vinod K, G S Gohil, R K Nagarale
exaly   +3 more sources

Thermal degradation of sulfonated poly(aryl ether ether ketone)

Journal of Analytical and Applied Pyrolysis, 1995
The thermal degradation of sulfonated poly(aryl ether ether ketone) (SPEEK), with various degrees of sulfonation, was investigated by high resolution pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and thermogravimetry (TG). It was found that the pyrogram of SPEEK is similar to that of poly(aryl ether ether ketone) (PEEK), but that the ...
Yuanfang Luo
exaly   +2 more sources

Synthesis and structural properties of sulfonated poly ether ether ketone (SPEEK) and Poly ether ether ketone (PEEK)

AIP Conference Proceedings, 2020
Polyether ether ketone (PEEK) is one of the most important aromatic polymers; it has many applications in nanotechnology. The new sulfonated polyether ether ketone (sPEEK) membrane was successfully prepared, by using sulfonation processed for PEEK polymer; 10 grams of PEEK sample were dissolved progressively in 200 ml of sulfuric acid (H2SO4).
Salah M. S. Al-Mufti   +2 more
openaire   +1 more source

Synthesis and properties of poly(ether ether ketone ketone)‐poly(ether sulfone) block copolymers

Journal of Applied Polymer Science, 1996
Poly(ether ether ketone ketone)-poly(ether sulfone) (PEEKK/PES) block copolymers were prepared from the corresponding oligomers via a nucleophilic aromatic substitution reaction, and the M n of the PEEKK segment was fixed at 12,000, while the M n 's of the PES segment ranged from 250 to 12,680.
Junkui Cao   +3 more
openaire   +1 more source

Sulfonated poly(ether sulfone ether ketone ketone)/sulfonated poly(ether sulfone) blend membranes with reduced methanol permeability

High Performance Polymers, 2012
Proton exchange membranes were prepared by blending sulfonated poly(ether sulfone ether ketone ketone) (SPESEKK) with sulfonated poly(ether sulfone) (SPES). The morphology, tensile strength, proton conductivity and methanol permeability of the blend membranes were investigated.
Rong Zeng   +3 more
openaire   +1 more source

Cation permeable membranes from blends of sulfonated poly(ether ether ketone) and poly(ether sulfone)

Journal of Membrane Science, 2002
Sulfonated poly(aryl ether ether ketone), S-PEEK, is blended with non-sulfonated poly(ether sulfone) (PES) to adjust the properties of ion permeable and ion selective membranes. In this study, membranes are prepared from blends with (i) a S-PEEK content between 10 and 100 wt.% using one S-PEEK batch with a fixed degree of sulfonation and (ii) from ...
Wilhelm, F.G.   +4 more
openaire   +2 more sources

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