以丙烯酸为单体,接枝淀粉,添加由十六烷基三甲基溴化铵(CTAB)改性的4A沸石,采用水溶液法制备了低成本的淀粉接枝丙烯酸/有机4A沸石复合高吸水性聚合物。通过红外吸收光谱(FT-IR)和扫描电镜(SEM)等表征手段对4A沸石、有机4A沸石、有机4A沸石/淀粉接枝丙烯酸复合高吸水性聚合物的结构和形貌进行分析,讨论了CTAB用量对4A沸石和复合材料结构和形貌的影响;研究了CTAB用量对复合高吸水性聚合物吸水倍率和溶胀动力学的影响。结果表明:CTAB对沸石的改性仅存在于沸石表面,CTAB的引入不会对4A沸石的晶体结构造成影响;当CTAB用量为4A沸石阳离子交换容量(CEC)的200%时,复合高吸水性聚合物的吸水倍率和初始溶胀速率均达到最大值,分别为355g/g和4.77g/(g·min)。
Organo-zeolite 4A modified by hexadecyltrimehtylammonium bormide (CTAB) was introduced into the aqueous solution polymerization to prepare starch-g-poly (acrylic aicd)/organo-zeolite 4A with starch and acrylic acid.Organo-zeolite 4A prepared with different content of CTAB and the superabsorbent composites dopted organo-zeolite were characterized by FT-IR and SEM.The effect of the content of CTAB used in the preparation of organo-zeolite 4A on water absorbency and swelling behavior of the superabsorbent composite in distilled water were investigated.The results indicated that the CTAB cations were successfully absorbed in the surface of zeolite and the content of CTAB had significant influence on swelling behaviors of the superabsorbent composites.When the content of CTAB was two times of CEC,the water absorbency of the superabsorbent composite achieved 355g/g,and the initial swelling rate constant reached 4.7g/(g·min).
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