PPESK Poly phthalazinone ether sulfone

PAN, polyacrylonitrile PP, polypropylene PPSU, polyphenylsulfone PPBES, copoly(phthalazinone biphenyl ether sulfone) PPESK, poly(phthalazinone ether sulfone ketone) PPENK, poly(phthalazinone ether nitrile ketone) PMDA/ODA PI, poly(pyromellitic dianhydride-co-4,4 -oxydianiline). 

PPESK poly(phthalazinone ether sulfone ketone)... 

The majority of polymer membranes used for microfiltration and ultrafiltration of liquids are prepared by the wet phase inversion process. Such membranes exhibit a typical asymmetric structure characterized by a thin dense surface layer and a thick microporous bulk. Poly(phthalazinone ether sulfone ketone) (PPESK) copolymers, c.f. Figure 7.10, show glass transition temperatures in the range of 263-305°C. The polymers show an outstanding chemical stability. They are soluble only in 98% H2SO4. Concentrated aqueous solutions of sodium chlorate, hydrogen peroxide, acetic acid, and nitric acid show no effect. ... 

Sulfonated poly(phthalazinone ether sulfone ketone) (sPPESK) (Eig. 1.10) was prepared by sulfonation of PPESK with faming H2SO4. The proton conductivity of sPPESK (DS of 81%) was 0.013 at 80 °C (not much lower than that of Nafion 15). On the other hand, its permeability to methanol at 15 °C was apparently nearly 40 times less than that of Nafion 115. These results seem to indicate that the Faraday efficiency of DMFCs may be good, if sPPESK membranes are used as PEMs [168]. 

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