摘要
通过红外光谱法对硅胶固载γ-氯丙基三甲氧基硅烷和γ-胺丙基三甲氧基硅烷的原料和中间产物进行表征,并研究了其反应情况。常温下,原料硅胶、固载γ-氯丙基三甲氧基硅烷产物红外光谱测定结果受吸附水干扰严重;选择在200℃和350℃测定,干扰基本消失;结果证明,γ-氯丙基三甲氧基硅烷已通过与自由羟基的反应键合到硅胶表面,且γ-氯丙基三甲氧基硅烷与硅胶的固载反应主要与自由羟基有关。350℃对原料硅胶、固载γ-胺丙基三甲氧基硅烷产物进行红外光谱分析结果说明γ-胺丙基三甲氧基硅烷已通过硅胶表面羟基的反应键合到硅胶表面,且键合反应不仅与自由羟基有关,也与互相键合的氢键和吸附水相关的表面羟基有很大关系。通过红外光谱分析,证明了对于硅胶固载γ-胺丙基三甲氧基硅烷的反应,使用二甲苯作溶剂要好于以甲苯作反应溶剂。
The silica gel carried γ-chlopropyltrimethoxysilane and γ-aminopropyltrimethoxysilane was determined by means of infrared spectroscopy. It has been proved that the infrared spectrums of the silica gel materials, intermediates carried γ-chlopropyltrimethoxysilane was interfered severely by adsorbed water. So the temperatures of 200 ℃ and 350 ℃ were chosen to avoid the interference. The results show that γ-chlopropyltrimethoxysilane and γ-aminopropyltrimethoxy silane are carried on the surface of the silica gels by the reaction with the surface hydroxyl groups. The carried reaction involved γ-chlopropyltrimethoxysilane mainly relates to free hydroxyl groups, while the carried reaction involved γ-aminopropyltrimethoxysilane relate to not only free hydroxyl groups but also those hydroxyl groups which are associated with adsorbed water or with adjacent hydroxyl groups. It has also been proved by infrared spectrum that dimethylbenzene is better reacting solvent for the carried reaction involved γ-chlopropyltrimethoxysilane.
出处
《石油化工高等学校学报》
CAS
2003年第2期20-24,共5页
Journal of Petrochemical Universities
