Polysilazanes are a class of high-performance polymer materials with silicon-nitrogen bonds as the main chain. They are mainly divided into two categories: organic polysilazanes and inorganic polysilazanes. Due to differences in molecular structure, their properties and applications are drastically different.
Structurally, inorganic polysilazanes, also known as perhydropolysilazanes, contain only silicon, nitrogen, and hydrogen elements in their molecules, without any organic carbon groups, resulting in a pure and dense structure. Organic polysilazanes, on the other hand, have organic side groups such as methyl groups attached to the silicon-nitrogen main chain, belonging to an organic-inorganic hybrid structure, with carbon as its core characteristic.
In terms of performance, inorganic polysilazanes can be converted into a silicon nitride ceramic layer after curing, exhibiting high hardness, high temperature resistance, corrosion resistance, and excellent insulation properties, but the coating is relatively brittle and less flexible. Organic polysilazanes retain the characteristics of organic groups, offering better flexibility, stronger adhesion, better adaptability for room temperature curing, and a higher tolerance for construction errors; however, their high temperature resistance and corrosion resistance are inferior to those of inorganic counterparts.
Application scenarios are precisely differentiated: inorganic versions are mostly used in harsh working conditions such as semiconductors, high-end anti-corrosion, and ultra-hard wear-resistant coatings; organic versions are more suitable for civilian and general industrial fields such as conventional industrial protection, composite material bonding, and general rubber and plastic protective coatings.