Silazane and polysilazane have a relationship between inclusion and inclusion, basis and polymerization upgrade. The following is a specific analysis:
Structural composition relationship
Silazane: refers to monomers, oligomers, cyclic and linear polymers with 1-4 Si-N repeating units in compounds, which are the basic units or primary forms that make up polysilazane.
Polysilazane: a polymer composed of elements such as silicon, nitrogen, and hydrogen, connected by silicon nitrogen bonds (Si-N) as repeating units. The main chain is composed of alternating silicon and nitrogen atoms, generally referring to oligomers, cyclic, polycyclic, and linear polymers or resin polymers with at least 5 Si-N repeating units in the compound.
Chemical property relationship
Silazane: It has certain reactivity and can undergo reactions such as ammonolysis, making it an important raw material for preparing polysilazane.
Polysilazane: Inheriting some basic chemical properties of silazane, and due to its polymer structure, its chemical properties are more active, with high reactivity with water, polar compounds, oxygen, etc.
Physical property relationship
Silazane: usually has a relatively small molecular weight and may be in liquid or low melting point solid form, with a certain degree of volatility.
Polysilazane: With a relatively large molecular weight, its physical properties vary greatly depending on its degree of polymerization and structure. It may appear as a high viscosity liquid, rubber like or solid, and generally has good film-forming properties, mechanical properties, and thermal stability.
Preparation method relationship
Silazane: can be synthesized by ammonolysis methods such as reacting ammonia or primary amine with halogenated silane.
Polysilazane: can be obtained from silazane through further polymerization reactions, such as aminolysis of bis functional group containing silane to synthesize cyclotriazane or cyclotetrazane, and then prepared by ring opening polymerization. It can also be directly polymerized from specific monomers.
Application domain relationship
Silazane: Due to its simple structure and special reactivity, it is mainly used in some basic chemical synthesis reactions as an intermediate or raw material to prepare more complex compounds such as polysilazane. It can also be used in situations where molecular weight requirements are not high and its active groups need to be utilized for further reactions.
Polysilazane: It has a wide range of applications in various high-end technology fields, such as being used as a ceramic precursor to prepare ceramic materials such as silicon nitride and silicon carbide. Through processes such as melt spinning, non melting treatment, and high-temperature sintering, silicon nitride fibers or Si-C-N ceramic fibers can be prepared; It can also be used in the field of coatings as functional coatings for high temperature resistance, corrosion resistance, wear resistance, etc; Used in the aerospace field for the preparation of high-temperature structural materials, thermal barrier coatings, etc

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