SYNOPSISSuperabsorbent polymers based on guargum have been prepared through a graft-copolymerization reaction using acrylonitrile as the monomer by a gamma ray-induced irradiation technique. Various grafting parameters have been studied. The grafted products have been characterized using infrared spectroscopy, thermogravimetric, and differential thermal analysis. The thermograms reveal the superior thermal stability of the grafted product over the control a t all stages of its degradative cycle. The maximum absorbency obtained of the superabsorbent product was around 300 g/g.
SynopsisSuperabsorbent polymers were prepared using acrylonitrile grafted to corn starch employing low levels of gamma ray radiation as initiator. Various grafting parameters have been studied at these low dosages. Absorbency values for the final products are reported. Use of the above superabsorbent as a desiccant has been evaluated. The product will find application where dispersions of low viscosity and high water absorbencies are desired.
M[II] (UO₂AsO₄)₂ • 8H₂O où M[II] = Zn, Ni et Co, ont été synthétisés par précipitation. Les paramètres de la maille tétragonale, avec Z = 2 et le groupe spatial P4₂/m, sont : a = 7,226 ± 0,02 ; c = 17,12 ± 0,06 Å pour M = Zn ; a = 7,177 ± 0,02 ; c = 17,24 ± 0,06 Å pour M = Ni ; a = 6,979 ± 0,02 ; c = 16,93 ± 0,06 Å pour M = Co.
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