环糊精对粘土的修饰改性研究

摘要

Cyclodextrin (CD)modified clays were synthesized by polycondensation of carboxylated CD (CMCD) and two kinds of calys such as sodium montmorillonite (MMT)and laponite,which were firstly modified by si-lane coupling agents with different chain lengths and functional groups.Effect of types of the clays and silane coupling agents on the amounts of CD into clays were investigated.The structures of the clays before and after modifications were characterized by Fourier transform infrared (FT-IR)and nuclear magnetic resonance (1 H NMR).X-ray diffraction (XRD)and thermo gravimetric analyzer (TGA)were used to detect the modification forms and amounts of CD.The results show that silane coupling agents and CD could modified both on the sur-face and intercalation of the clays.The amounts of CD into laponite are higher than that into MMT.Moreover, when the functional groups of silane coupling agents was less,the distance of the modified clays was larger and the amounts of CD was higher.%选用蒙脱石和锂皂石两种无机粘土为基本原料，分别用不同链长和功能基数目的3种硅烷偶联剂改性粘土，使粘土表面带有功能性胺基；再将其与羧甲基化的环糊精(CMCD)通过酰胺化反应生成环糊精改性的复合材料，探讨使用不同种类粘土和偶联剂对CD接入量的影响。所得产物的结构用傅里叶转换红外光谱(FT-IR)、质子核磁共振(1 H NMR)进行表征；并用 X 射线衍射(XRD)和热失重分析仪(TGA)检测复合物中硅烷偶联剂及CD的接入方式和含量。研究结果表明，偶联剂和 CD 不但能够对粘土的表面偶联修饰而且以插层形式进入粘土的层间；偶联剂和 CD接入锂皂石的质量分数要比接入蒙脱石的更多；对于同一种粘土，当偶联剂功能基团较少时，可显著增大粘土的层间距，且偶联剂和CD的接入量较多。