Synthesis of low molecular weight polysilazane
  
1.1 Aminolysis, Ammonolysis Reaction

    The main synthesis method of low molecular weight polysilazane is aminolysis, aminolysis and polycondensation reaction. The main steps are as follows: ammonia gas is introduced into dimethyldichlorosilane (Me2SiCl2), methyl hydrogen dichlorosilane (MeSiHCl2) and toluene. The solution of chlorosilane in benzene, mechanical stirring to continue the reaction, standing for precipitation, drying and filtration, washing with benzene solvent and fractional distillation. The research shows that the higher the content ratio of Me2SiCl2 in the chlorosilane benzene solution, the shorter the time required for the aminolysis reaction and the larger the molecular weight of the reaction product. The low molecular weight polysilazane prepared by this method has an average molecular weight of 1300, but its chemical properties are relatively unstable, the body can be quickly cross-linked, and the reaction product can be prepared by high-temperature pyrolysis to prepare high-yield silicon nitride ceramics mixed with pure silicon.

1.2 Synthesis of Cyclosilazane

    Studies have shown that cyclotriazane and cyclotetrasilazane can be synthesized by ammonolysis of bifunctional halosilanes, and polysilazane quaternary rings can be synthesized by the reaction of ammonia, dilithium amide and dichlorosilane. Tong Xiujun et al. used Me2SiCl2 as the reaction monomer, reacted with solid ammonium chloride and ammonia water, and recrystallized to obtain octamethylcyclotetrasilazane.


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