Synthesis and characterization of poly (acrylamide-co-acrylate) and kaolin hydrogel composites: effect of the constitution of different kaolins from northeastern Brazil

Química Nova

Ricardo, Nágila M. P. S.¹  Universidade Estadual Vale do Acaraú, Sobral, Brasil¹  Feitosa, Judith P. A.¹  Muniz, Edvani C.¹  Silva, Lindomar R. D. da¹  Rodrigues, Francisco H. A.¹  Universidade Estadual de Maringá, Maringá, Brasil¹  Universidade Federal do Ceará, Fortaleza, Brasil¹  Brito, Carlos W. de Q.¹  Fernandes, Marcus V. da S.¹ 

关键词: superabsorbent hydrogels;    clay;    agriculture.;   

DOI  :  10.1590/S0100-40422013000100008

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 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】

Unknown