丙烯酸-丙烯酰胺原位插层共聚制备高吸水性蒙脱土纳米复合材料的研究
Preparation of Superabsorbent Montmorrilonite Nanocomposites by Method of in-situ Intercalation-Copolymerization with Acrylic Acid and Acrylamide
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摘要: 在钠基蒙脱土(MMT)悬浮液中,采用丙烯酸(AA)和丙烯酰胺(AM)两种单体进行原位插层共聚,得到高吸水性纳米复合材料。研究了引发剂和交联剂对材料吸水率的影响。X射线衍射(XRD)结果表明:复合材料中蒙脱土片层001面的层问距随mMMT/mM的减小而增大,当mMMT/mM≤1/3时,复合材料中的蒙脱土已完全剥离。DSC测试表明,在蒙脱土含量较低时,其玻璃化转变温度Tg随MMT含量的升高逐渐提高。吸水速率和保水能力测试结果表明,材料吸收去离子水能力达610g/gR,吸收盐水(wNaCl=0.009)能力达89g/gR。蒙脱土片层的引入。在一定程度上提高了材料的初期吸水速率和加压下的保水能力。Abstract: The superabsorbent nanocomposites were prepared by an in-site intercalation -copolymrization method with acrylic acid and acrylamide in montmorrilonite( MMT) suspension. The effects of initiator and cross-linker on their water absorption were studied. XRD