Polyaromatic ether-ketone

Sulfonation is very useful chemical modification of polymer, as it induces high polarity in the polymer changing its chemical as well as physical properties. Sulfonated polymers are also important precursors for ionomer formation [75]. There are reports of sulfonation of ethylene-propylene diene terpolymer (EPDM) [76, 77], polyarylene-ether-sulfone [78], polyaromatic ether ketone [79], polyether ether ketone (PEEK) [80], styrene-ethylene-butylene-styrene block copolymer, (SEBS) [81]. Poly [bis(3-methyl phenoxy) phosphozene] [82], Sulfonated polymers show a distinct peak at 1176 cm"1 due to stretching vibration of 0=S=0 in the -S03H group. Another peak appears at 881 cm 1 due to stretching vibration of S-OH bond. However, the position of different vibrational bands due to sulfonation depends on the nature of the cations as well as types of solvents [75, 76]. 

J. Lee, C.S. Marvel, Polyaromatic ether-ketone sulfonamides prepared from polydiphenyl ether-ketones by chlorosulfonation and treatment with secondary amines, J. Polym. Sci. Part A Polym. Chem. 22 (2) (1984) 295-301. 

M. I. Litter, C. S. Marvel, Polyaromatic ether-ketones and polyaromatic ether-ketone sulfoa-mides from 4-phenoxybenzoyl chloride and 4,4 -dichloroformyldiphenyl ether, J. Polym. Sci Polym. Chem. Ed. 23(8), 2205-2223 (1985). 

We now have found two classes of substituted polyaromatic ether-ketones and polyaromatic ether-keto-sulfones... 

Important information on the rapid degradation two polyaromatic (protiated) membranes has been provided recently using direct ESR. The two membranes were sulfonated poly (phthalazinone ether ketone) and sulfonated poly(ether ether ketone) the former was found to be more stable to attack by hydroxyl radicals. 

A wide variety of substituents are tolerated. The group R can be alkyl, halogen, alkoxy, -amido, azi-domethyl, ester, aryl, aryloxy and aryloyl, and at least one ortho substituent is permissible with no loss in yield. TTie aromatic ring can also be 2-naphthyl, 9,10-dihydro-2-phenanthryl, 3-pyridyl, thiophen-2-yl or pyrrol-3-yl. The group R can be hydrogen, yl, acyl or acetic acid. Beyond Ae antiinflammatory targets, successful reaction substrates include the methyl ketones of a binaphthyl crown ether, a morphinane and a polyaromatic hydrocarbon. The preparation of ibuprofen methyl ester (38) is shown in equation (37) as a typical example. ... 

The chemistry associated with these different regimes is itself very varied depending on the experimental conditions, especially the temperature and the equivalence ratio of the mixture, and is often very complex, with the formation of numerous unsaturated hydrocarbons, aromatics and polyaromatics and of oxygenated molecules (aldehydes, ketones, alcohols, cyclic ethers...), all of these species are likely to be atmospheric pollutants. 

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