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    Exploiting urazole’s acidity for fabrication of hydrogels and ion-exchange materials
    (MDPI, 2021) Hanay, Saltuk Bugra; Fallah, Ali; Senturk, Efsun; Yetim, Zeliha; Afghah, Ferdows; Yılmaz, Hülya; Culha, Mustafa; Koc, Bahattin
    In this study, the acidity of urazole (pKa 5–6) was exploited to fabricate a hydrogel in two simple and scalable steps. Commercially available poly(hexamethylene)diisocyanate was used as a precursor to synthesize an urazole containing gel. The formation of urazole was confirmed by FT-IR and1 H-NMR spectroscopy. The hydrogel was characterized by microscopy imaging as well as spectroscopic and thermo-gravimetric analyses. Mechanical analysis and cell viability tests were performed for its initial biocompatibility evaluation. The prepared hydrogel is a highly porous hydrogel with a Young’s modulus of 0.91 MPa, has a swelling ratio of 87%, and is capable of exchanging ions in a medium. Finally, a general strategy was demonstrated to embed urazole groups directly into a crosslinked material.