Among the synthesis methods of polysilazane, dehydrogenation coupling method and ring opening polymerization method are relatively environmentally friendly. The following is a specific analysis:
Dehydrogenation coupling method
Reaction principle and characteristics: Compounds containing silicon hydrogen (Si-H) and nitrogen hydrogen (N-H) undergo dehydrogenation coupling reaction to generate polysilazane. This reaction is usually carried out under relatively mild conditions, without the need for large amounts of organic solvents and highly corrosive and toxic reagents.
Environmental advantages: The main byproduct generated is hydrogen, which is a relatively clean substance with less pollution to the environment and does not produce large amounts of harmful waste like other methods.
Open-loop polymerization method
Reaction principle and characteristics: Polysilazane is formed by ring opening polymerization of silazane ring under certain conditions. By selecting appropriate catalysts and reaction conditions, high reaction selectivity and conversion rates can be achieved.
Environmental advantages: Compared with ammonolysis and hydrazine hydrolysis, open-loop polymerization does not require the use of large amounts of substances such as ammonia and hydrazine that may be harmful to the environment and human health. It also does not require the use of organic solvents as reaction media, and produces fewer by-products during the reaction process, resulting in relatively less impact on the environment.
However, there are certain environmentally unfriendly factors such as ammonolysis, ammonolysis, and hydrazine hydrolysis. Ammonia hydrolysis and amine hydrolysis usually require the use of large amounts of ammonia or amine compounds, which have irritating odors and may pose certain hazards to the environment and human health. After the reaction, pollutants such as nitrogen-containing wastewater may be produced; The hydrazine used in the hydrazine hydrolysis process is toxic and may produce some harmful by-products during the reaction, posing potential risks to the environment.

Room termperature curing polysilazane, pls check IOTA 9150, IOTA 9150K. 
High termperature curing polysilazane, pls check IOTA 9108, IOTA 9118.