插层剂与蒙脱石结构对蒙脱石插层改性的影响

Effect of Structures of Intercalating Agent and Montmorillonite on Intercalation Modification of Montmorillonite

选用4种不同结构类型的插层剂对3种具有不同结构特性的蒙脱石(MMT)进行了有机化插层改性,采用X-射线衍射研究了插层剂与MMT的结构对不同MMT插层改性的影响。结果表明:带有双烷基链的插层剂的插层效果要远远优于单烷基分子链的插层剂,MMT层间距相比增大了2.65～3.67 nm。单烷基链插层剂较易进入MMT层间,层间距的变化受MMT本身的结构特性影响较小;而选用双烷基链插层剂时,MMT本身的结构特性对其层间距变化的影响较大,不规整的层间结构和较小的层间距限制了插层剂分子进入MMT层间。插层剂中含有的苄基对不同MMT层间距的影响表现出较大的差异性。

Three kinds of montmorillonites（MMTs） with different structural characteristics were organically modified by four kinds of intercalating agents with various structures.The effects of intercalating agents and MMTs structures on organic modification of MMT were investigated by X-ray diffraction.The results showed that intercalating agents with two alkyl chains had the better intercalation effect than that with only one alkyl chain,the spacing of MMT layers was increased by the values between 2.65 and 3.67 nm.Intercalating agents with one alkyl chain could intercalate the MMT layers easily,the MMT structural characteristics had little influence on the changes of the spacing in this condition.However,when using intercalation agents with two alkyl chains,the changes of the spacing were depended on the MMT structural characteristics.The intercalation of intercalating agents into the MMT layers was prevented by the irregular layer structures and the relative lower spacing of MMT.The benzyl group in the intercalation agent had large difference effect on the spacing of MMT layers for different MMTs.