Urazoles are nitrogen-containing heterocycles that have been mostly used as precursors of triazolinediones (TADs). TADs have recently attracted attention owing to their click and clicklike reactions. Urazoles can readily be oxidized to TADs by strong oxidants. Alternatively, some urazoles can be aerobically oxidized to corresponding TADs by laccase enzyme. Urazole oxidation can also be achieved in situ using a ruthenium photocatalyst. In general, TAD or in situ oxidized urazole forms adducts that urazoles are bound to a material or a polymer via urazole's amide nitrogen. On the other hand, there are only a few reports that urazole is attached to material via its imide nitrogen. It is important to note that urazole group is untouched when attached via imide nitrogen. However, in these previous two reports, urazole oxidized to TAD and reacted further for other purposes. Therefore, urazole were not utilized as functional group. Urazole has rarely been thought as functional group due to TAD's highly successful click reactions. However, urazole protons are highly acidic and might be exploited to obtain functional materials having anionic character. The acidity of urazole was studied in details as proton-transfer reactions . In one study, the acidity of urazole was exploited to obtain novel polymers via N-alkylation. Some urazole derivatives, such as 4-oleyl urazole and 1,2 Diacetyl-4oleyl urazole, have been patented as additives for functional fluids. The potential of urazoles as analogs of prostaglandins in bronchodilation has been demonstrated. Interestingly, urazole was thought to be a precursor of uracil in the pre-RNA world, as it reacts with ribose to form four different ribosides. Recently, Yang et. al. used urazole to synthesize urazole-gold nanoparticles to determine curcumine using a fluorescent spectrometer. Our strategy to obtain a urazole-containing material involves embedding urazole's precursor (semicarbazide) in the polymer backbone rather than attaching urazole directly to a material. The latter strategy is challenging because of the amide protons of urazole. Semicarbazide was cyclized to urazole on the material in a solid state step under strong basic conditions . The resulting urazole-containing gel was a hydrogel, with 87% swelling ratio and 0.91 mPa elastic modulus. Interestingly, the polymer backbone of the material is highly hydrophobic, with the ionic salt character of urazole conferring hydrophilicity. We also demonstrated that a urazole-salt ionic pair can be exploited as an ion exchanger. When the hydrogel was placed in tap water, it successfully removed Ca+2 and Mg+2 from the water.