硅胶固载硅烷偶联剂的核磁共振波谱研究

通过核磁共振波谱对硅胶固载γ-胺丙基三甲氧基硅烷和γ-氯丙基三甲氧基硅烷的原料和中间产物进行表征. 原料硅胶核磁共振谱上存在与表面羟基相关的峰，但不是很明显；采用交叉极化方法测定的原料硅胶和固载胺丙基硅烷产物的交叉极化硅核磁共振谱极大提高了与表面羟基相联的硅谱峰的强度，进一步说明了硅胶表面的硅羟基反应比较完全；固 载γ-氯丙基三甲氧基硅烷产物的交叉极化硅核磁共振谱表明，在硅胶表面上已固载了氯丙基硅烷.

CHARACTERIZATION OF REACTION-CARRYING SILOXANE ON THE SURFACE OF SILICA GEL BY NUCLEAR MAGNETIC RESONANCE SPECTROMETRY

The silica gel carried γ-chlopropyltrimethoxysilane and γ-aminopropyl trimethoxysilane were characterized by nuclear magnetic resonance spectrometry. It was shown that the hydroxyl groups on the surface of silica gel substrate giv es only non-distinctive bands. The intensities of the bands related to the surfacehydroxyl groups can be remarkably enhanced by cross polarization. The result suggests that γ-chlopropyltrimethoxysilane and γ-aminopropyltrimethoxysilane we recarried on the surface of the silicagel, and the reactions were relatively completed.