两性纳米复合高吸水性树脂的结构与性能

通过丙烯酸钠、阳离子单体丙烯酰氧乙基三甲基氯化铵(DAC)与钠蒙脱土原位溶液聚合成功地制备了具有插层结构的两性纳米复合高吸水性树脂. 其吸水性树脂吸水倍率和凝胶的抗压强度相对于聚丙烯酸钠基质均有较大提高. 吸水倍率最高可达2 380 g/g, 而凝胶的抗压强度提高到基质的180%左右. 由于复合材料结构上具有两性基团, 表现出对环境pH值特殊的应答性. 同时, 阳离子单体DAC的加入影响体系纳米结构的形成.

Structure and Characteristics of Polyampholyte Super-absorbent Nanocomposite

A novel polyampholyte super-absorbent nanocomposite with acrylate sodium, acryloyxyethyl trimethyl ammonium chloride(DAC) and montmorillonite(MMT) was synthesized by in situ solution polymerization in aqueous solution. The morphology structures of composites were investigated by XRD and TEM. The results show that a series of intercalated polymer-MMT super absorbent nanocomposite were produced. Due to the introduction of MMT, the swell ratio of nanocomposite was up to 2 380 g/g and the gel antipressure intensity was enhanced by 180%. In the same time, the investigation indicates that the formation of intercalated nanocomposite was promoted by the addition of DAC owing to the strong interaction between DAC and the platelets of MMT. On the other hand, the sensitivity of ampholyte composite to pH could be observed when the polyampholyte super-absorbent nanocomposites were soaked into NaCl solution with a mass fraction 0.9% at different pH values.