热处理对苯基化硅胶物理结构和表面性质的影响-常州大学学报(自然科学版)

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摘要:: 本文利用苯基三氯硅烷分子和硅胶表面羟基反应制备了苯基化硅胶。测定了苯基化硅胶在不同热处理温度下的物理结构数据、水蒸气吸附量和润湿热,并用差热分析研究了若干苯基化硅胶的热稳定性。结果表明:上述诸性质随热处理温度升高而不连续地变化着,即实验数据常有两个转折点,在150℃有一最小值,在500～600℃有最大值。这分别是由于亲水硅胶表面羟基的苯基化作用以及苯基化硅胶的有机化层的破坏所致。

Abstract:: The phenylated Silica gel has been prepard by the reaction between the Surface hydroxyl groups and phenyltrichlorosilane molecules. The data of physical structure, water vapor adsorption and heat of wetting have been determined at different temperatures of heat treatment, and the thermal stability of some phenylated Silica gel has been studied by DTA. The results show that the above mentioned properties change inconsecutively with increasing temperature of heat treatment, i.e. the experimental data exhibit two crippling points in general, one minimum at 150℃, and the other (maximum) at 500-600℃. This is due to the phenylation of surface hydroxyl groups of hydrophilic Silica gel and the destruction of organized layers of phenylated Silica gel respectively.