封端法测定羟基硅油的羟基含量  

Determination of Hydroxyl Content in Hydroxyl Silicone Oil by End-blocking Method

作　　者：余学成 杨建静[1] 熊英[1] 唐红定[1] 

机构地区：[1]有机硅化合物与材料教育部工程研究中心,武汉大学化学与分子科学学院,武汉430072

出　　处：《有机硅材料》2018年第1期57-61,共5页Silicone Material

基　　金：国家自然科学基金面上项目(21574101)

摘　　要：以吡啶为缚酸剂,采用羟基硅油与过量二甲基氯甲基氯硅烷反应,产物提纯后直接由核磁共振氢谱算得羟基硅油的平均摩尔质量与羟基含量。该方法准确性和重现性较好,避免了传统Li Al H4测定方法中水分的干扰,适用于测定有确定分子式或有固定基团比例的羟基硅油。The end-blocking product was prepared by HCL agent of pyridine, the hydroxyl silicone oil reacted with the excess （chloromethyl）dimethylchlorosilane. Then it was purified and the average molecular weight and hydroxyl content in the silicone oil were determined by the calculation of the integration in 1 H NMR spectrum. It featured with the high accuracy and good reproducibility, avoiding the traditional method with LiA1H4, since it could eliminate the interference of the water. It could be used to determine the hydroxyl con- tent in silicone oil with a definite molecular formulator or with the fixed proportion of hydroxyl silicone oil.

关 键 词：羟基 硅油 含量 平均摩尔质量 封端法 

分 类 号：TQ324.21[化学工程—合成树脂塑料工业]