硅烷偶联剂改性纳米二氧化钛并接枝丙烯腈的机理

Mechanism of nano-TiO_2 modified silane coupling agent and grafting acrylonitrile

主要研究了硅烷偶联剂(KH-560)改性纳米二氧化钛(TiO2)制备TiO2(KH-560)以及TiO2(KH-560)与丙烯腈(AN)接枝聚合生成TiO2(KH-560)-g-AN的反应机理。通过傅里叶变换红外(FT-IR)分析确定了TiO2(KH-560)和TiO2(KH-560)-g-AN的官能团结构。通过X射线光电子能谱(XPS)分析,由TiO2(KH-560)中的氧元素和碳元素结合能的微小变化,引起C1s、O1s化学环境的变化,来确定TiO2(KH-560)的结构;由TiO2(KH-560)-g-AN的氧元素、碳元素和氮元素的结合能微小变化引起C1s、O1s、N1s化学环境的变化,从而确定了TiO2(KH-560)-g-AN的结构。结合FTIR和XPS两者的分析,最终确定TiO2(KH-560)-g-AN的反应机理。

The reaction mechanism of nano-titanium dioxide （TiO2） modified with the silane coupling agent （KH-560） grafted with acrylonitrile（AN） to produce TiO2（KH-560）-g-AN was studied. Functional group structures of TiO2 （KH-560） and TiO2（KH-560）-g-AN were determined by Fourier transform infrared （FT-IR） analysis. The results of X-ray photoelectron spectroscopy （XPS） analysis show that chemical environment of C1s,O1s in TiO2（KH-560） are caused by slight variations of oxygen and carbon element binding energy in TiO2（KH-560）. So the structure of TiO2（KH-560） is determined. Chemical environment of C1s,O1s,and N1s in TiO2（KH-560）-g-AN are caused by slight variations of oxygen,carbon,and nitrogen element binding energy in TiO2（KH-560）-g-AN. So the structure of TiO2（KH-560）-g-AN is determined. The graft polymerization mechanism of TiO2（KH-560） and AN is determined ultimately by the analysis of both FT-IR and XPS.