Polyether ether ketone membranes

T. Shimoda and H. Hachiya. Process for preparing a polyether ether ketone membrane. US Patent 5 997 741, assigned to Asahi Kasei Kogyo Kabushiki Kaisha (Osaka, JP), December 7,1999. 

S. Banerjee, K.K. Kar, M.K. Ghorai, S. Das, Synthesis of polyether ether ketone membrane with pendent phosphonic acid group and determination of proton conductivity and thermal stability, High Perform. Polym. 27 (2015) 402-411. 

V. SUva, B. Ruffmann, H. Silva, H. Mendes, A. Madeira and S. P. Nunes, Zirconium oxide modified sulfonated polyether ether ketone membranes for direct methanol fuel cell applications, Materials 2003-11 International Materials Symposium, Caprica, Portugal, April 14-16 (2003). 

Membrane materials often employed are hydrophobic polysulfone or hydrophilic regenerated cellulose or cellulose acetate other materials are nylon, polytetrafluoro-ethylene (PTFE, Teflon), polyether ether ketone (PEEK) or poly(divinyl fluoride) (PDVF). 

P. Zschocke and D. Quelhnalz. Integral asymmetric, solvent-resistant ultrafiltration membrane made ol partiahy sulphonated, aromatic polyether ether ketone. DE Patent 3 321860, assigned to Berghol Eorschungsinst (DE),... 

S. Zaidi, S. Mikhailenko, G. Robertson, M. Guiver, S. Kaliaguine, Proton conducting composite membranes from polyether ether ketone and heteropolyacids for fuel-cell applications. Journal of Membrane Science 173 (2000) 17-34. 

Ismail AF, Othman NH, Mustafa A (2009) Sulfonated polyether ether ketone composite membrane using tungstosilic acid supported on silica-aluminium oxide for direct methanol fuel cell (DMFC). J Membr Sci 329 18-29... 

Figure 7.16 Water uptake in sulfonated polyether-ether ketone (SPEEK) +Ti02 nanocomposite membranes as a function of the filler content. 0 refers to the untreated T1O2,1 to the dopamine-treated Ti02, and 2 to the polyethylene-imine-treated T1O2.

S. Li, D.J. Rocha, S.J. Zhou, H.S. Meyer, B. Bikson, and Y. Ding, Post-combustion CO capture using super-hydrophobic, polyether ether ketone, hollowfiber membrane contactors. Journal of Membrane Science, 430,79-86,2013. 

It has been suggested that instead of membranes made from perfluorinated sulfonic acids (PFSAs), membranes be used made from other, heat-resistant polymers containing the sulfonic acid group. One could think here of sulfonated polyimides (SPIs) and sulfonated polyether ether ketones (SPEEKs). Membranes made from such polymers have a sufficiently high protonic conductivity at elevated temperatures but are less sensitive to lower humidities and water loss. 

Most polymers used today are thermoplastics. Poiypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), and polystyrene (PS) often find application as low-end consumer items, packaging or others. Technical parts are produced mostly from acrylonitrile-butadiene-styrene-copolymer (ABS), polyamide (PA), polybutylene terephthalate (PBT), polyoxymethylene (POM), polyether sulfone (PES), polycarbonate (PC), polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), polyether ether ketone (PEEK), or polyimide (PI). Polyvinyl chloride (PVC) is a material often used in building construction, especially for roofing membranes, window frames, and pipes, and its properties (rigid or flexible) are generally modified by additives. 

S. M. J. Ztiidi, S. D. Mikhailenko tmd S. Kaliaguine, Sulfonated polyether ether ketone based composite polymer electrolyte membranes, Catal. Today 67, 225-236 (2001). 

S. M. J. Zaidi, S. D. Mikhailenko and S. Kaliaguine, Electrical properties of sulfonated polyether ether ketone/polyetherimide blend membranes doped with inoigtmic acids, J. Polymer Sci. B Polym. Phys. 38, 1386-1395 (2000). 

F. G. Wilhelm, 1. G. M. Pimt, N. F. A. Van der vagt, H. Strathmann and M. WessUng, Cation permeable membranes from blends of sulfonated Polyether ether ketone and polyether sulfone, J. Membr. Sci 199, 167-176 (2002). 

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