Surface Modification Of Mesoporous Silica Platelets And Its Application

Recently,as an important functionalization method,surface modification has been a hotspot in the material research.Having been surface modified,the capability of the mesoporous materials will be improved,and it will come into the excellent fictionalization mesoporous materials.This paper is based on the usages in the different fields,through the way of mesoporous materials surface organic modification method to enhance the hydrophobicity of the mesoporous materials,and have further,research and discuss for the preparation and the character of the polymer/mesoporous silica platelet composite.Adopting the post-transplanting method,more than ten surface modifiers such asγ-Aminopropyl triethoxysilane,γ-Methacryloxypropyl trimethoxy silane,Silane coupling agent KH-792,Octadecyl-trimethoxysilane,Tetrabutyl titanate,stearic acid, xylitol,n-Octanol,Dodecanol and Hexadecanol have been grafted on the surface of the SBA-15 mesoporous Silica platelet,and also through the testing methods such as N₂absorption-desorption,FT-IR,SEM,TEM,TG,DTA and elemental analysis to characterize the sample.The result indicates that after the surface modificating,the sample keep the uniform ordered mesoporous pore channel,and its hydrothermal stability and hydrophobicity have been improved.Especially,when modified by n-Octanol,the number of organic functional groups grafted on the surface of mesoporous is the most,and the hydrophobicity have the most obviously improve.The SBA-15 mesoporous Silica platelet,which has been surface modified by the n-Octanol,with polymer HDPF and PET together to carry through the composite prepared by melt blending.The preparation of the SBA-15 mesoporous Silica platelet /HDPE and SBA-15 mesoporous Silica platelet /PET composite,and tested the sample character by the methods of electronic universal testing machine,SEM and DSC.Knowing from the SEM photograph,the sample,which has been surface modified by the n-Octanol,disperses uniformly in the matrix HDPE,and has good compatibility.When it contains 3%SBA-15 meso-porous silicon wafer,the tensile strength of the composite material increases 47.75%,and the bending strength 7.9%.