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首页> 外文期刊>Quimica nova >Synthesis and characterization of poly (acrylamide-co-acrylate) and kaolin hydrogel composites: Effect of the constitution of different kaolins from northeastern Brazil [Síntese e caracteriza??o de hidrogéis compósitos a partir de copolímeros acrilamida-acrilato e caulim: Efeito da constitui??o de diferentes caulins do nordeste Brasileiro]
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Synthesis and characterization of poly (acrylamide-co-acrylate) and kaolin hydrogel composites: Effect of the constitution of different kaolins from northeastern Brazil [Síntese e caracteriza??o de hidrogéis compósitos a partir de copolímeros acrilamida-acrilato e caulim: Efeito da constitui??o de diferentes caulins do nordeste Brasileiro]

机译：聚（丙烯酰胺-丙烯酸酯）和高岭土水凝胶复合材料的合成与表征：巴西东北部不同高岭土的构成的影响[丙烯酰胺-丙烯酸酯与高岭土共聚物的复合水凝胶的合成与表征：构成的影响巴西东北部不同的高岭土]

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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 (W_(eq)) decreased with increasing clay content and the amount of crosslinking agent. Superabsorbent hydrogel (W_(eq) > 1084 g H_2O/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.
机译：通过自由基水共聚制备了基于聚丙烯酰胺-丙烯酸酯和不同高岭土的超吸收水凝胶。 FTIR和WAXS技术用于表征一系列水凝胶，这些水凝胶是通过改变粘土的百分比，交联和高岭土的组成而获得的。随着粘土含量和交联剂含量的增加，平衡时的吸水率（W_（eq））降低。当使用10重量％的白色高岭土和使用0.05摩尔％的交联剂时，获得超吸收性水凝胶（W_eq）＞ 1084g H_2O / g凝胶）。水凝胶被证明对pH变化和盐的存在敏感。

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