羟基封端二甲基-二苯基硅氧烷低聚物的合成

Synthesis of Hydroxyl Terminated Oligo(dimethyldiphenyl) siloxane

以吡啶为缚酸剂,二甲基二氯硅烷与过量二苯基硅二醇反应得到二羟基封端二甲基-二苯基硅氧烷低聚物,采用核磁和红外光谱表征其结构。采用封端法测定了其平均摩尔质量和羟基含量。此低聚物具有二甲基与二苯基交替结构,是一种重要的羟基封端聚硅氧烷中间体。

Hydroxyl terminated oligo( dimethyldiphenyl) siloxane was prepared in the presence of pyridine,the excessed dihydroxydiphenylsilane,and dimethyldichlorosilane,whose structure was determined by ~1H NMR,^(13)C NMR and FT-IR. Its average molecular weight and hydroxyl content were measured by end-blocking method. The hydroxyl terminated oligomer featured with the alternative structures of dimethylsiloxy and diphenylsiloxy,and could be used as an important silicone intermediate.