以椰糠粉为基体材料,丙烯酸和丙烯酰胺为单体,N,N-亚甲基双丙烯酰胺(MBA)为交联剂,过硫酸钠为引发剂,采用水溶液聚合法制备了椰糠粉/聚丙烯酸-丙烯酰胺复合吸水材料.较优的合成条件是:单体与椰壳粉质量比为8∶1,丙烯酸的中和度为70％,引发剂用量是单体质量的0.8％,交联剂N,N-亚甲基双丙烯酰胺用量是单体质量的0.2％,反应时间4h,温度50℃.对最佳条件下制备的吸水材料进行了FTIR和SEM表征及吸水性、保水性、重润胀性等测试,并且对该材料在去离子水和0.9％ NaCl溶液中的吸水性进行对比.此外,用分子扩散方程及一级、二阶动力学模型对其吸水溶胀过程进行模拟研究.结果表明,该复合吸水材料在去离子水和盐溶液中的吸水倍率分别是273.54 g/g和44.54 g/g;吸水动力学表明水分扩散满足Fickian扩散,且一级动力学方程能描述润胀吸水过程;该材料重润胀3次后仍具有很好的吸水性.
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