Síntese e caracterização de hidrogéis compósitos a partir de copolímeros acrilamida-acrilato e caulim: efeito da constituição de diferentes caulins do nordeste brasileiro

Química Nova

Carlos W. De Q. Brito²  Francisco H. A. Rodrigues²  Marcus V. Da S. Fernandes¹  Lindomar R. D. Da Silva¹  Nágila M. P. S. Ricardo¹  Judith P. A. Feitosa¹  Edvani C. Muniz¹ 

[1] ,Universidade Estadual Vale do Acaraú Coordenação de Química Sobral CE ,Brasil

关键词: superabsorbent hydrogels;    clay;    agriculture;   

DOI  :  10.1590/S0100-40422013000100008

来源: SciELO

【 摘 要 】

Superabsorbent hydrogels based on poly (acrylamide-co-acrylate) and different kaolins, were prepared by free-radical aqueous copolymerization. FTIR and WAXS techniques were employed for characterization of a series of hydrogels, obtained by varying the percentage of clay, crosslinking and constitution of kaolin. The water absorbency at equilibrium (Weq) decreased with increasing clay content and the amount of crosslinking agent. Superabsorbent hydrogel (Weq > 1084 g H2O/g gel) was obtained as 10 wt% of white kaolin and 0.05 mol% of crosslinking agent were used. The hydrogel proved sensitive to pH variation and the presence of salts.

【 授权许可】

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