从二氯甲烷与元素硅直接合成的六氯二硅甲烷经醇解制得六乙氧基二硅甲烷。用Grignard法以甲基依次取代乙氧基,合成一至五甲基取代的二硅甲烷。发现偶数甲基的对称取代物产率较高。将这些甲基取代的单官能到五官能的单体在溶剂乙醚中水解缩聚,只五官能的单体得到不溶不熔的体型聚合物,三官能的单体部分成为线型聚合物,其余的都变为环状、并环状及笼状结构的低聚物。四官能单体和二官能的单体共聚也得到具并环结构的低聚体。本文对于这些产物结构进行阐明和讨论,并证明聚硅甲硅氧烷环化倾向很大,从而生成小分子化合物。 Hexachlorodisilazane, synthesized directly from methylene chloride and elemental silicon, was hydrolyzed to produce hexaethoxysilane. The Grignard method was used to replace the ethoxy groups with methyl groups to synthesize mono-pentamethyl-substituted disilanes. Symmetrical substitutions of even methyl groups were found to have higher yield. The methyl-substituted monofunctional to pentafunctional monomers are hydrolyzed and polycondensed in a solvent ether, and only the pentafunctional monomer gives an insoluble and insoluble body-type polymer, the trifunctional monomer portion becomes a linear polymer, and the remaining All become a ring, and the annular and cage-like oligomers. Copolymerization of tetrafunctional and difunctional monomers also gives oligomers with a ring structure. In this paper, the structures of these products are elucidated and discussed, and it is demonstrated that polysiloxanes tend to cyclize very well to generate small molecule compounds.