(1) Firstly, in the 1920s, researchers began to attempt to synthesize silazane cyclomers and oligomers and classify them. In this regard, A. Stock made groundbreaking work, but during this period, the development of polysilazanes was slow.

(2) The outbreak of World War II led to the successful commercialization of polysiloxanes in the 1950s and 1960s, which greatly sparked researchers' enthusiasm for the study of polysiloxanes similar to polymers - polysiloxanes. During this period, researchers mainly used methods similar to the preparation of polysiloxanes, such as ring opening polymerization, to prepare polysiloxanes, and studied their main properties, hoping to be applied in the form of polymers, but the progress made was extremely limited.

(3) In 1976, S Yajima et al. successfully obtained SiC fibers by cracking polysilane, with the trade name Nicalon SiC fibers being applied. Researchers have turned their attention to polysilazane, hoping to prepare Si3N4 and Si-C-N fibers by designing appropriate molecular structures of polysilazane. Therefore, during this period, researchers mainly focused on the spinnability of polysilazane and how to solidify and decompose it. Since then, polysiloxane as a precursor polymer for ceramics has become a research hotspot for researchers, and the polymer precursor method has also become a new method for preparing ceramics. In short, it is a method of preparing ceramic products by cracking polymers with specific molecular compositions at high temperatures (usually above 1000 ℃) under a certain atmosphere.

(4) In the 1990s, R The Reidel research team prepared Si-B-C-N ceramics by introducing B element into polysilazane, which has a temperature resistance of 2200 ℃. This has led researchers to focus on modifying polysilazane to prepare functional or higher temperature resistant Si-C-N ceramics. Subsequently, Si-Fe-C-N ceramics with magnetic properties, Si-Ag-C-N ceramics with antibacterial properties, and Si-Zr-C-N ceramics with good anti crystallization properties were successively prepared by modifying polysilazane.

For a long time, polysilazane has been mainly used as a precursor for Si3N4 or Si-C-N ceramics, so most work has focused on expanding its application by utilizing its high-temperature pyrolysis conversion to form ceramic materials. Currently, it has been extended to fields such as coatings, adhesives, ceramic based composites, ceramic thin films, microelectromechanical systems (MEMS), and porous ceramics.