不同链长的聚醚铵阳离子协同插层对蒙脱土性能的影响

为了制备高性能的聚合物/蒙脱土纳米复合材料,必须对蒙脱土(MMT)进行有机改性来改善蒙脱土表面的疏水性、提高蒙脱土与聚合物之间的相容性,同时也需要尽可能地增大蒙脱土的层间距.为此,提出了一种采用不同链长的聚醚铵阳离子协同插层MMT的新方法,即采用D2000(或T5000)聚醚铵盐与D400聚醚铵盐协同插层MMT,并采用X射线衍射分析(XRD)和热重分析(TGA)研究了协同插层对改性MMT的层间距、有机含量以及耐热性的影响.另外,也研究了插层过程中的搅拌方式和D400聚醚铵盐多次插层对改性MMT的层间距、有机含量等的影响.研究结果表明,采用长链聚醚铵阳离子协同插层更有利于提高D400聚醚铵盐改性MMT的层间距和有机含量;T5000协同插层MMT中总的有机含量(64.06%)进一步增加,这可能是因为T5000的支链在MMT层间形成的笼型结构既提供了更大的空隙,又起到了屏蔽作用,同时也得到了较大的层间距(6.86 nm).

Co-intercalation of Montmorillonite by Poly（oxypropylene）Amine Hydrochlorides with Different Chain Length

In order to improve the performance of polymer/montmorillonite nanocomposite,montmorillo-nite(MMT) must be modified organically so that the hydrophobicity of MMT and the compatibility between polymer and MMT can both be increased.In spite of this,it is also necessary to enlarge the basal spacing of MMT.In this paper,a new method was developed to co-intercalate MMT with two poly(oxypropylene) amine hydrochlorides with different chain length.Therefore,two kinds of co-intercalated MMTs,D400-D2000-MMT and D400-T5000-MMT were prepared.Their basal spacing,organic fraction and ther-mal stability were investigated by XRD and TGA,respectively.In addition,the effect of stirring methods and the number of intercalation times were also investigated.The results show the co-intercalation method can largely increase the basal spacing and organic fraction of MMT modified with D400.T5000 amine hydrochloride is much better than D2000 to increase the basal spacing(6.86 nm) and organic fraction(64.06%) of co-intercalated MMT because of the cage structure comprised of branched chain of T5000 between the layers of MMT co-intercalated.