微粒二氧化硅(即白碳黑)是硅橡胶的主要填料,其表面性质对橡胶的增强和老化有显著的影响。我们曾报导用氢化铝锂转化色谱法测定硅树脂中的羟基及液体中的微量水,方法简便准确。此法加以改进也可推广用以分析二氧化硅表面的羟基含量。操作方法基本和硅树脂中羟基分析的方法相同,但需要解决二氧化硅粉末向密封的试剂系统进样的问題。将约0.2克样品在10毫升容量瓶中加热数小时以脱吸附水(称量空瓶和加热后之样品瓶计算样品重量),然后加入惰性溶剂充分振荡使粉末在液体中分散,并冲稀至刻度。用250微 Particulate silica (white carbon black) is the main filler of silicone rubber, and its surface properties have a significant impact on rubber reinforcement and aging. We have reported that lithium aluminum hydride conversion chromatography determination of hydroxyl in the silicone and liquid trace water, the method is simple and accurate. This method can be improved to promote the analysis of silica surface hydroxyl content. The method of operation is essentially the same as for hydroxyl analysis in silicone, but there is a need to solve the problem of silica powder injection into a sealed reagent system. Approximately 0.2 grams of the sample is heated in a 10 ml volumetric flask for several hours to desorb the water (weigh the empty sample and the sample vial after heating) and then add an inert solvent and shake thoroughly to disperse the powder in the liquid. To the scale. With 250 micro